Among the following, which is the most basic towards BMe3? options- (a)Me3N (b)Et3N (c)O2 (d)SO3. answer- (a)?

Question

the answer is (a)Me3N
"Me" means methyl. "Et" means ethyl.
all the numbers written are in subscript.

PLZ give me a proper reason for the answer, i guarantee selecting a convinving answer as the best one.

Answer 1

To be basic, an atom needs a lone pair, and the three methyl groups push the most extra electron density into the lone pair on N in (CH3)3N.