Question

Which sentence is written in the active voice?

The order was placed yesterday afternoon by the science director's assistant.
The science director's assistant placed the order yesterday afternoon.
Yesterday afternoon, the order was placed by the science director's assistant.
Yesterday afternoon, the placement of the order was done by the science director's assistant.

Answer 1

what is it

Answer 2

is it b? idk

Answer 3

That’s correct! Because sentence B is the only one where the subject is performing the action (the assistant places the order) rather than the order having the action done to it.