Which sentence is in the passive voice?

a.The flowers had been planted by a group of volunteers.
b.Acorns dropped from the old oak tree.
c.The Thunder had scared the young children.
d.The snow covered the city streets

Question

Which sentence is in the passive voice?

a.The flowers had been planted by a group of volunteers. 
b.Acorns dropped from the old oak tree. 
c.The Thunder had scared the young children.
d.The snow covered the city streets

anonymous · Answer

The first sentence. When put in the active voice, it would be "A group of volunteers planted the flowers"