Which of the following sentences is written in the ACTIVE voice?

A
After the swim meet, many cheeseburgers were eaten by a swim team of hungry kids.
B
After cheeseburgers were eaten by many hungry kids, the swim team finished the swim meet.
C
After many hungry kids on the swim team finished the swim meet, they ate cheeseburgers.
D
After the swim meet, many hungry kids from the swim team ate cheeseburgers.