PEOPLE’S CARELESSNESS CAN CAUSE FOREST FIRES. THEY ARE DANGEROUS.A...

22. People’s carelessness can cause forest fires. They are dangerous.

A. People’s carelessness can cause forest fires are dangerous.

B. People’s carelessness can cause forest fires which dangerous.

C. People’s carelessness can cause forest fires, that is dangerous.

D. People’s carelessness can cause forest fires which are dangerous.