The answer is B. the word less is an adjective that tells how much
forming two clauses and is illogical
You use "it's" as a formal Contraction, it's short for 'it is' or 'it has'.
For example, 'it's a wonderful day's
You use "so" when you are describing something
For example, 'it's so hot'
"So" is also another word for "very", which is where the word originally generated. it's often mixed up with "such", but dont worry! you'll learn English alot soon!
”If people are doubting how far you can go,
go so far that you can’t hear them anymore.”
-Michele Kuiz