An adverb clause will modify a verb, adjective, or other adverb. It will contain a subject and a verb. It will begin with a subordinating conjunction. It will answer the questions { why, how, when, where, or under what condition}.
I'll agree to your proposal because I have no other choice.
ur adverb clause is : because I have no other choice.....it is modifying the verb " agree " answering the question " why ".......why will u agree....because u have no other choice.
