Which sentence has a grammatical error? a. everyone who wants to succeed in life needs to manage his or her money. b. when e-mail goes down, every one of the teachers holds their breath anxiously. c. harrison wasn't sure if his work was good enough to pull an a in his biology class. d. the two men hadn't seen each other since graduation, so they almost didn't recognize each other.

D. The two men hadn't seen each other since graduation, so they almost didn't recognize each other.

Explanation:

The correct use of commas are to put them in between independent clauses, parts of a sentence that can work on their own as their own sentence.

The two parts of this sentence are not independent clauses. The first part is an independent clause, though: "The two men hadn't seen each other since graduation." The second part is a dependent clause, it needs the first part to work: "so they almost didn't recognize each other." This sentence alone doesn't say who "they" are. The subjects are not determined, so it is a dependent clause.

The correct sentence would be the same thing but without the comma.

"The two men hadn't seen each other since graduation so they almost didn't recognize each other."

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