Answer:
C. I want autumn to last forever so that winter never comes.
Step-by-step explanation:
A fused sentence is a sentence made out of other full sentences that are already complete by themselves, both sentences have a subject and a verb, in this case the first sentence is "I want autumn to last forever", and the second is so winter never comes, this are two separate sentence that can be understandable by themselves, but together make a new sentence.