Two sentences joined with a coordinating conjunction and a comma form a compound sentence. If it were a complex, it would have a dash. If it were a comma splice, it would have a dash and a dash. If it were a run-on, it wouldn't have either, just a lot of and in it.
Hope this helps. :D
Answer:
ITS MOOD
Explanation:
NOT 100% SURE BUT AS FAR IS MY SMALL KNOWLEDGE.
C. A strong storm takes out the electricity on an island.