Select the option that expresses the given sentence in active voice.
The national anthem was being sung very enthusiastically by young students in the annual event.

A

The young students in the annual event were singing the national anthem very enthusiastically.

B

The national anthem was sung very enthusiastically for young students in the annual event.

C

The young students in the annual event had been singing the national anthem very enthusiastically.

D

The national anthem sang the young students very enthusiastically