Choose the most suitable option to replace the highlighted part of the sentence:
No one knows where is he hiding.

Correct option is C

The correct substitution of the highlighted words is (c) where he is hiding.
Explanation: In an indirect question (embedded question) after verbs like know, ask, wonder, we do not use question word order. So “where is he hiding” (question order) becomes “where he is hiding” (statement order). Therefore, option (c) is grammatically correct and fits the sentence perfectly.
Grammatical rule used:
· Indirect question = Wh-word + subject + verb (no inversion)
· Example: I don’t know where she lives. ( not “where does she live”)
· Information booster / exceptions:
· “At” is unnecessary here because hide doesn’t require it: “where he is hiding” is complete.
· Only direct questions take inversion: “Where is he hiding?” (direct).