Which of the following prepositional phrases can function as an adverbial？（2012)A．Are you

Which of the following prepositional phrases can function as an adverbial？(2012)

A．Are you sure of Simon"s disappearance？

B．The man with a beard is talking to the manager.

C．Every precaution was taken against the failure of the plan.

D．Despite the rain, everyone enjoyed the trip.

请帮忙给出正确答案和分析，谢谢！