Question

The best way to refuse an offer to smoke or do drugs is to __________.

Answer 1

Hey there!
Great question=)

The best way to refuse an offer to smoke or do drugs is to firmly say "no"

You can easily eliminate, c and d. 

I hope this helps=)
If you have any questions about my work, feel free to ask^-^

Answer 2

a. firmly say "no".................................