Answer:
A is the correct answer.
Explanation:
Instead of saying ___(noun)___ was ___(verb)___ by ___(noun or personal pronoun)___, it says that ___(noun)___ ___(verb)___ ___(something)___. (If this explanation doesn't make sense, I'll give you an example).
Ex: The man was hit by the car.
The car hit the man.
In the first sentence, the man is the first noun, was hit is the verb, and the car is the other noun. In the second one, the car becomes the first noun, was hit changes to just hit, and the man becomes the second noun.
