What is the best way to change this sentence from passive voice to active voice

AFrancisco, the multitalented guitarist, was chosen by the band to be their lead singer
BThe band chose the multitalented guitarist Francisco to be their lead singer
CChosen was the multitalented guitarist Francisco, by the band, to be their lead singer
DFrancisco, the multitalented guitarist, was chosen, by the band, to be their lead singer

Verified Answer :

a. Francisco, the multitalented guitarist, was chosen by the band to be their lead singer. 
This is the only grammatically correct passive sentence in the choices. D has the same words and arrangement but is very poorly punctuated

The answer is 'b' because the subjece 'The band' is necessary in the sentence