Identify the highlighted clause in the given sentence.
They lay down when they had finished their work.

Correct option is C

The correct answer is (c) Adverb Clause.
• Highlighted clause: “when they had finished their work”
• It tells the time of the action “lay down” (when did they lay down?).
• A clause that answers when/where/why/how about the main verb works as an adverb clause.
Grammatical Rule Used (English):
• “when” introduces an Adverb Clause of Time.
• Adverb clause modifies the verb of the main clause.
Grammatical Rule Used (Hindi):
• “when” समय बताता है, इसलिए यह समयवाचक Adverb Clause है।
• यह मुख्य क्रिया “lay down” के समय को बताकर उसे modify करता है।