Which words in the sentence are the adverb clause?

After we collected signatures, the committee presented the petition to the chairperson.

A. to the chairperson

B. the committee presented the petition

C. After we collected signatures

Question

Which words in the sentence are the adverb clause? 

After we collected signatures, the committee presented the petition to the chairperson.
 
 A. to the chairperson
 
 B. the committee presented the petition
 
 C. After we collected signatures

anonymous · Answer

BRB

anonymous · Answer

I am fairly certain that the answer is C. :-)