Final answer:
The correct compound-complex sentence is D, which fulfills the criteria with two main clauses and one subordinate clause.
Step-by-step explanation:
The compound-complex sentence from the choices provided is, if you join us for dinner, I will roast a turkey, and my wife will bake a casserole. This sentence contains two main clauses ('I will roast a turkey' and 'my wife will bake a casserole') and one subordinate clause ('If you join us for dinner'), fulfilling the criteria of a compound-complex sentence structure.
Options A, B, and C do not contain the necessary combination of main and subordinate clauses to qualify as compound-complex sentences. Compound sentences are formed by joining two independent clauses with a coordinating conjunction or a semicolon, while complex sentences contain an independent clause and at least one dependent or subordinate clause.