Select the option that expresses the given sentence in passive voice.
Martha made pancakes yesterday.

Correct option is C

The correct passive voice of the given sentence is Pancakes were made by Martha yesterday.
Explanation:
· Active Voice: Subject (Martha) + verb (made) + object (pancakes).
· Passive Voice: Object (Pancakes) + was/were + past participle (made) + by + subject (Martha).
Correct Sentence: Pancakes were made by Martha yesterday.
Why Other Options Are Incorrect:
· (a): "Had been made" changes the tense to past perfect, which is incorrect.
· (b): "Were being made" suggests ongoing action, which is incorrect here.
· (d): "Was made" is grammatically incorrect because "pancakes" is plural.