A and D are grammatically correct! B and C are 100% incorrect.
In A, you can write "You are quite a..." as "You're quiet a...", but in D ,i don't see an error. So it's a 50-50 in my opinion.
I'm not a 100% sure on the right answer, but i can assure you that the answer is either A or D. Hope it helps!
C
Because
A.this is in the stratosphere
B.Thats the exosphere
D.this is from the ozone layer which is in the stratosphere
The answer would be C) It provides current factual information
I believe it is A, semicolons as it separates the the thoughts as you're reading.
