The use of the comma in the middle of this sentence is completely unnecessary and weirdly divides the sentence into two. No punctuation is needed in this sentence, and the best choice is to remove the comma. Therefore, the correct answer choice is "Making a great deal of money is rarely a path to happiness."

The sentence does not need more commas inserted into it, but fewer. The sole usage in the sentence is a comma splice, or a random insertion of a comma where it should not be. The correct answer choice is "Many former army commanders came out against the plan in newspapers as soon as the story was leaked."

The use of the comma after "circumstances" is incorrect, as the verb "would" connects the conditional phrase to the rest of the sentence. This means no punctuation is necessary, so "Under no circumstances would he let" is the correct answer.

The phrase "about his new job" is vital to the construction of the sentence, as it provides information about the second part of the sentence; therefore, it should not be set apart by commas. The correct answer is "The worst part about his new job."

Inserting a comma between "nothing" and "but" is incorrect, as the sentence is one complete thought, and should not be broken up by a comma. The only thing that needs to be changed is that the comma needs to be removed from the sentence. Therefore, the correct answer choice is "The fourth place finisher at the Olympics receives nothing but the satisfaction of representing his or her country and competing."

The phrase "wherever he felt like it" is a dependent clause that explains more about the main body of the sentence. All dependent clauses must be set apart from the rest of the sentence by a comma. As such, "spitting constantly, wherever he felt like it" is the correct answer choice.

The sentence in the question is a compound sentence, one that joins two complete thoughts to show their relationship to each other. While the conjunction "as" connects the two parts, it also needs a comma to join the two thoughts together correctly. Therefore, the correct answer choice is "The issue proved to be a hot topic for years, as ten years later it was still being debated in leading universities."

The sentence is written as a compound sentence, containing two complete independent clauses, but does not properly connect them. A compound sentence must be connected either by a semicolon or a comma and conjunction, which in this sentence is "because." Therefore, the correct answer choice is "Home cooks are at a disadvantage to professional chefs, because the quality of their equipment is not at the same level."

The phrase "as it was all they had to eat" is used as an explanatory phrase, which is unnecessary to the construction of the sentence. Such a phrase needs to be set apart from the rest of the sentence by a comma; therefore, the correct answer is "the poor meat, as it was all they had to eat."

The phrase "preferring to use simplifying language" is a dependent clause, a clause that cannot be used as a complete sentence but instead relies on other information. Although it cannot stand alone, it still needs to be separated from the rest of the sentence by a comma; therefore, the correct answer is " displays of his verbal acuity, preferring to use simplified language."