Plants . . . . . . by the gardener, see.

A. are being watered

B. are watering

C. are being watering

D. are watered

Answer: Option A

Solution(By Examveda Team)

Sentence is in present continuous tense in passive voice.
Rule :
Subject + is/am/are + being + V³ + other agents.
Plants are being watered by the gardener, see.