A compound sentence is made up of two independent sentences usually joined together by a coordinating conjunction. Independent sentences can stand alone. In the sentence above, there are two independent clauses that are joined together by a semicolon. The two independent clauses are;
Mom baked the cake.
I iced it.
A simple sentence has just one independent clause, while a complex sentence has an independent clause and oneor more dependent clauses.
I think it is <em>D</em> because '<u>voice was rich and dramatic</u>' was never mentioned in the passage. If you got it correct, you can give me brainliest if you'd like! <u>Have a splendid day! <3</u>