Only #2 is acceptable to me.
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.
sb700121. She is one of the girls who smokes a lot. Correct => this is correct because maybe I want to emphasize the word "girls".No, it does not emphasize 'girls', and the grammar is wrong.
sb700122. She is one of the girls who smoke a lot. Correct => this is correct because maybe I want to emphasize the word "one".