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.

Write a speech about a current practice - anything people commonly do in society today - that you think the people of the future will see as a form of discrimination. what are some practices that are legal today that you think limit people's rights? do you yourself feel you're being treated unfairly? you'll support your ideas with evidence you find through research. you'll also enhance your speech with audio or video.