Given the use of "students" as the subject, we know that we will need to use a plural pronoun. Therefore, "they" would be a more appropriate pronoun to use than "she."

The error in the current sentence is a lack of consistency in pronoun usage. Since we use the word "one" as our pronoun initially, we should keep using the word "one" as our pronoun throughout the rest of the sentence.

It is clear that the pronoun is supposed to refer to "law," which is a singular noun. Furthermore, laws do not have a gender, so the correct pronoun would be "it." The choice "the law" would be redundant because it is already clear that we are still speaking about the "law."

The sentence begins with the pronoun "We" but switches to the pronoun "they." We must therefore change the second pronoun to "we" in order to maintain grammatical consistency.  

The use of the reflexive pronoun "myself" is incorrect in this sentence, as it has no earlier pronoun or noun to reflect back to in the earlier part of the sentence. The correct pronoun for this sentence is the simple objective pronoun "me." The only answer choice that makes the correct change to the underlined portion of the sentence is "either by him or me."

The use of "I" in the final quoted part of this sentence is incorrect, as it is functioning as an object of the preposition "for," but "I" is the subjective form of the first person pronoun. The correct pronoun for the object in a sentence is "me." Therefore, as the only answer choice to use the right pronoun, the correct answer is "said the Secretary of State, "for both me and the President."

The use of the objective pronoun "who" in this sentence is incorrect, as the pronoun is the object of the preposition "of." Pronouns that function as objects of prepositions need to be in their objective forms, not their subjective forms. The correct answer choice is the one in which "who" is changed to "whom"; this means that "all of whom were interested in what political positions" is the correct choice.

The underlined portion of the sentence is the object, and both words need to be in the objective form. "Him" is objective, but "I" should only be used as a subject. The correct answer is "to me and him."

The problem with the sentence is in the two pronouns underlined. The correct usage of the first person pronoun as an object is "I," not "me." Additionally, "you" should come before "I." 

The speaker and Trudy together form the subject of the underlined clause, and so both pronouns need to be subject pronouns. Of the options given here, "she and I" is the only one where this is the case ("we," of course, would also work).