Ask you teacher if you are really having trouble. Cheaters never prosper, but I would say C, if it is located next to the sun. Just talk to your teacher about anything you could be having trouble with, THAT IS WHY THEY ARE THERE!

EDIT, I thought you said THERMOSTAT not THERMOSPHERE!!! I was just going to say extreme heat at first, :p. Still ask for help if you need it!

I hope this helps, and you get help if you need it! Good Luck!

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