Still, he could not help thinking that if anything______, the nearest person he could cont

Still, he could not help thinking that if anything______, the nearest person he could contact by radio, if there was a ship nearby, would be on an island 885 miles away.

A．were happening

B．should happen

C．would happen

D．had happened

请帮忙给出正确答案和分析，谢谢！