Answer:
C. Correct.
Step-by-step explanation:
A comma splice is when a comma is wrongly used to join two independent sentences without using an appropriate conjunction. Likewise, a fused sentence is one where two independent sentences are joined together without using appropriate punctuation or a conjunction.
The given sentence uses the comma and a conjunction to join the sentences together. The sentence starts with a subordinating conjunction "when" and also the coordinating conjunction "and".
Thus, the correct answer is option C.