I think that 20% of smokers wanting to quit smoking would be too narrow because that is only 20 people out of 1,000,000 that want to quit smoking versus 90% of people that would lie to quit.
Answer:
B
Explanation
An adjective is something that describes a noun or a verb. In B, the adjective (actively) is describing the verb (making).
There is a missing apostrophe in the word "can't"