Choose the most appropriate option to change the voice (active / passive) form of the given sentence.
Two children were shot dead by a psychopath during the California music festival.

A

Two children were being shot dead by a psychopath during the California music festival.

B

Two children are shot dead by a psychopath during the California music festival.

C

A psychopath during the California music festival was shooting dead two children.

D

A psychopath shot dead two children during the California music festival.