Question

which statement is a refusal strategy?
\i will try it once, but thats it.\
\i like to use a different brand.\
\my parents will be very disappointed in me.\
\my friends and i prefer weed to what you are using.\

Explanation:

A refusal strategy often involves giving a reason to decline an offer. Saying "My parents will be very disappointed in me" is a way to decline by citing a consequence related to family expectations. The other statements are not clear - cut refusals. "I will try it once, but that's it" is more of a conditional acceptance, "I like to use a different brand" is a preference - based statement not a strong refusal, and "My friends and I prefer weed to what you are using" is an odd comparison and not a refusal in the traditional sense.

Answer:

"My parents will be very disappointed in me."