The correct answer is D. The rain finally stopped we continued our baseball game.
Step-by-step explanation:
In grammar, a fused sentence takes place if there are two independent clauses or sentences and these have been put together without any element between them (conjunction or punctuation mark). An independent clause can be identified because it expresses a complete idea and does not depend on other clauses which means it does not contain subordinating conjunction such as although, when, until, as, etc. According to this, the one that is a fused sentence is option D because this contains two independent clauses "The rain finally stopped" and "we continued our baseball game" with no conjunction or punctuation. Also, other options include a punctuation mark or contain the word "when" that indicates there is a dependent clause.