D - The cake is burned; and so we'll have to bake another one.
When using a semi-colon to combine two independent clauses (in a compound sentence), you much also use a coordinating conjuction. Option D is the only one with the coordinating conjunction (and).
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Answer: The three types of wholesalers are 1) merchant wholesalers; 2) agents, brokers, and commission merchants; and 3) manufacturers' sales branches and offices.
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From: Fluffy Strawberry