Select the option that expresses the given sentence in passive voice.

The first-year students are bidding farewell to their seniors.

A

Farewell is to be bid to their seniors by the first-year students.

B

Farewell was being bid to their seniors by the first-year students.

C

Farewell is being bid to their seniors by the first-year students.

D

Their seniors is being bid farewell by the first-year students.