In any list like the one in the underlined portion of the sentence, all the verbs in the dependent clause need to be in the same form to show the subject is doing similar actions. The only answer choice that appropriately features such parallel structure is "changing schedules, switching assignments, and breaking old rules."

The underlined portion of the sentence is incorrect, as any series needs to have a parallel structure, where all elements of the series are written in the same form. "Being harnessed, saddled, and ridden" is the only answer choice that is both correct grammatically and parallel in structure.

This sentence contains an error in parallelism. Specifically, it compares "of good luck" to "by skillful play." The prepositions used in these phrases should match because they are being compared—"more a result of X than by Y" doesn't treat format each item in a consistent manner. The only answer choice that fixes this issue is "good luck than of skillful play," making the corrected sentence "The success of the one-handed touchdown catch was more a result of good luck than of skillful play."

Any list like the one in the underlined portion of the sentence needs to have a parallel structure in their word forms, which the sentence does not have as written. Each item in such a list also needs to be separated by commas; therefore, the correct answer choice is "designing, building, and maintaining a house."

This sentence contains parallelism errors. Writing is more effective when related concepts are presented in the same manner. The correct choice is, "The interns fact-checked stories, interviewed local personalities, and assisted with various other tasks."

This sentence contains parallelism errors that make the sentence sound awkward. Parallelism refers to framing/phrasing different parts of a sentence in the same/similar way for the sake of consistency and flow. In this sentence, the word "offered" changes this flow without adding any essential information to the sentence. The sentence would function much better if this verb were phrased in the same as the previous verbs (was... -ing). The correct answer is: "Christiano was calling his clients: he was informing them of policy changes and was offering them discounts."

This sentence contains errors in parallelism. The latter half of the sentence does not follow the same pattern of verb + infinitive, which makes reading the sentence awkward. The best choice is, "Kendra loves to read in the afternoons, but loves to walk on some days of the week" since it follows the same pattern in the last half of the sentence. The other sentences are also incorrect because they contain shifts in tense, in addition to the parallelism issue.

This sentence contains an error in parallel structure. Since the verb in the first clause is "loved," one would expect the following verb to also be in the past tense. This is not the case, however. One of these verbs needs to be changed in order to match the same tense of the other in order for the sentence to make sense. The choice "Leah loves poetry and likes to write poems in her spare time" takes care of this issue. It is the correct choice.

This question deals primarily with parallel structure. You can say something has resulted not from X but from Y. The correct answer choice is the only one that maintains parallel structure in this way. If the "poor academic performance" "resulted from shortcoming in classroom instruction" they must also result FROM "insufficiently supportive home environments."

The issue being raised in this sentence is one of parallel structure. The basic structure of this sentence is: Gerund x is gerund y, in the same way that one might say "Seeing is believing. The only choice that fits that pattern is the correct answer, which replicates the correct and consistent parallel structure of the example sentence.