Answer:
Have gotten is the qorrect verb
I would say it's D because it's explaining how the sun's heat and warmth is being trapped
Using an absolute adjective in a comparative sentences makes your English sound strange so watch out! Another example of an absolute adjective is 'unique' because it means 'one of a kind' and, therefore, it can not be 'more unique' than something. It's either 'unique' or it isn't.
Very few officers in the service ever attain the Rank of General.
The answer should be the answer should be D