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.
I believe the answer is the third option "Because outside research adds scholarship to my own opinion." Hope this helps. (ﾉ◕ヮ◕)ﾉ*:･ﾟ✧
