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

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

Explanation:

Comma splice- an instance of using a comma to link two independent clauses (which should instead be linked by a colon, semicolon, or conjunction), as in he loves cooking, he's great at making curries.

the king's decision.

harlem's  cotton club boasted the talents of duke ellington. singers such as bessie smith and billie holiday popularized blues and jazz vocals. jelly roll morton and louis armstrong drew huge audiences as white americans as well as african americans caught jazz fever.