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Question:

Which punctuation mark is used incorrectly in the sentence below?
We agreed that Chris would plan our mom’s birthday party, he had already selected a restaurant, and I didn’t have time to pick up a gift.

A the comma after the word "party"
explanation

The comma after "party" creates a comma splice, where two independent clauses (“We agreed that Chris would plan our mom’s birthday party” and “he had already selected a restaurant”) are joined with a comma but no conjunction.