Answer :
for your question I would keep it as simple as possible "mediodía" for 12:00 pm and "medianoche" for 12:00 am.
the answer is C, es mediodía
the answer is C, es mediodía
the answer to that question is es medianoche cause you know that if it's 12 it's going to be midnight so therefore the answer is es medianoche. I hope this helped out a little.