A Compound sentence it has 2 independent clauses that has related ideas that can be joined by a coordinating conjuction.
Most likely A.
In this case a simple statement could be any of those, to shorten to the simple statement you would generalize :)
The correct answer is D. Even if you've never handled a trowel in your life, we're asking for you assistance.
because its a dependent clause and cannot stand alone and complex sentences are made up of dependent and independent clauses.
Hope this helps.
