I think option A is the right answer
I do not play Animal Crossing.
Sorry if this is late but the answer is B
Answer: Because of the fruitful harvest, instead of eating a modest Thanksgiving dinner, we filled our plates to the brim; an abundance of food was had that year.
Explanation:
Compound-complex sentences are typically complicated sentences. A compound-complex sentence usually has two or more independent clauses and also have at least one dependent clause.
From the options given, the option that is a compound-complex sentence is "Because of the fruitful harvest, instead of eating a modest Thanksgiving dinner, we filled our plates to the brim; an abundance of food was had that year".