Final answer:
The comma splice in the multiple-choice question is sentence B, where two complete sentences are incorrectly joined by just a comma.
Step-by-step explanation:
The question asks to identify which of the provided sentences is a comma splice. A comma splice occurs when two complete sentences (independent clauses) are joined improperly with just a comma. The correct answer is:
B. Many young adults today live at home with their parents, this allows them to save money.
This is a comma splice because 'Many young adults today live at home with their parents' and 'this allows them to save money' are both complete sentences that have been incorrectly joined by a comma without a coordinating conjunction. To correct it, you could use a period, a semicolon, or a coordinating conjunction (such as 'for'), as shown in the other answer choices.