The hospital may have exposed the patients to the viruses, becauseA．they tried to protect

The hospital may have exposed the patients to the viruses, because

A．they tried to protect their delicate instruments.

B．they didn"t follow the policy accordingly.

C．they didn"t know how to follow the policy sometimes.

D．they have good intentions but the end result is bad.

请帮忙给出正确答案和分析，谢谢！