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.
Start you claim, and write three valid reasons to support your claim and then go from there. Don’t forget you counterclaim and rebuttal.
you need to put the passage so we can tell you the answer
My sweet,quiet father surprised us with his outburst yesterday
Your only describing the father with 2 words. A comma is only necessary if you were using 3 words