In which of the following sentences is the verb in the active voice?

Question

A. The telephone bill was paid yesterday.
B. The mother called her son for lunch.
C. The boy was called by his mother.
D. We were told that Jim is ill.

Answer 1

In which sentence is the subject DOING the action of the verb?

The subjects are ...
~ bill
~ mother
~ boy
~ We

Answer 2

boy