Question

which sentence contains a comma splice? marco rode to school on his bicycle this morning, he arrived an hour early. marco, who enjoys riding his bicycle to school, arrived just before the bell today. marco rode to school on his bicycle on monday, tuesday, and wednesday. marco, who rode to school on his bicycle this morning, arrived an hour early.

Explanation:

A comma splice occurs when two independent complete sentences are joined only by a comma.

1. The first option has two independent clauses ("Marco rode to school on his bicycle this morning" and "he arrived an hour early") connected solely by a comma, which fits the definition of a comma splice.
2. The second and fourth options use commas correctly to set off non-restrictive relative clauses, which are dependent clauses, not independent sentences.
3. The third option uses commas properly in a list of days, with a coordinating conjunction "and" before the final item, so it has no comma splice.

Answer:

A. Marco rode to school on his bicycle this morning, he arrived an hour early.