Choose the option that is the passive form of the sentence.
A campus fire in California caused the death of at least twenty-three persons.

A

The death of at least twenty three persons will be caused in a campus fire in California.

B

The death of at least twenty three persons was caused by a campus fire in California.

C

At least twenty-three person's death was caused in a campus fire in California.

D

The death of at least twenty three persons caused a campus fire in California.