Select the option that expresses the given sentence in passive voice.
John bought sweets at the store when he visited yesterday.

A

Sweets were to be bought by John at the store when he visited yesterday.

B

Sweets were bought by John at the store when he visited yesterday.

C

Sweets were being bought by John at the store when he visited yesterday.

D

Sweets are bought by John at the store when he visited yesterday.