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.
the answer is D. Some of the world’s highest waterfalls can be found in three countries: Venezuela, South Africa, and Peru.
a colon in a sentence means the auther can end the sentence with a period if he wanted and the sentence would still be correct.
in this case the sentence could be, "Some of the world’s highest waterfalls can be found in three countries."
this still looks and sounds correct and is a fully functioning sentence.
The purpose for which something is predetermined or destined.
An act of appointing, setting aside for a purpose, or predetermining.
A place to which one is journeying or to which something is sent when the package has reached its destination kept their destination secret.
Edith Wharton Should be the answer to your question
I Hope This Helps
yes you have the explanation and everything correct as to why C would be the correct answer.