Which sentence has a verb that is in the passive voice? a. some people carry cell phones for the sake of convenience. b. convenience and efficiency have been delivered by the telephone. c. the telephone makes communication between people much easier. d. in 1876, alexander graham bell patented his invention, the telephone.

A sentence is in passive voice when the subject is acted upon by the verb.

The sentence in passive voice is B - convenience and efficiency have been delivered by the telephone.

In active voice this sentence would be: The telephone has delivered convenience and efficiency, wherein the subject (the telephone) is doing the action (delivering convenience and efficiency).

Idont know the answer