Passive voice is generally more appropriate than the active voice in four circumstances. One is when the agent is clear from the context, as in "Students are required to take both writing courses," in which it is clear that the college sets the requirements. Under what other circumstances is the passive voice generally more appropriate? A.

when the agent is less important than the action B.

when the agent is unknown C.

when a reference to the agent is embarrassing, dangerous, or in some other way inappropriate D.

All responses are correct. E.

None of the responses are correct.