The sentence is a simple compound sentence.
<span>A simple sentence is an accumulation of phrases that creates a comprehensive knowledge. Simple sentences are distinct from another sentence standards since they include barely one </span>independent clause<span> and have no </span>dependent clauses<span>.</span>
It would be C. is, it makes more sense saying "it is" and not "it are" or "it am"
UHHH WHAT AM I SUPPOSED TO SAY-
The first sentence because it’s the sun made the temperature a little better since it made it a little warmer