Answer:
A. Last Monday, a strange dog entered my yard.
B. Becky, your dress is lovely.
C. Behind the oak tree, a pumpkin was found. ✔
D. Walter jumped from one platform to another.
Explanation :
In passive voice:
Sentece structure = Subject + verb (to be) + past participle.
C. shows the correct structure. Hence, C. is in passive voice.
