Which of these is a run-on sentence?

A. Before lunch, I played volleyball; after lunch I did again.

B. I thought about what he'd said soon I realized he was right.

C. You and I and the whole team will go.

D. I went home and ate and ate.

A. Before lunch, I played volleyball; after lunch I did again.

B. I thought about what he'd said soon I realized he was right.

C. You and I and the whole team will go.

D. I went home and ate and ate.

Among the sentences that is considered a run - on is ‘I thought about what he'd said soon I realized he was right’. The answer is letter B.