The correct answer is A. "I'll have just one drink."
Step-by-step explanation:
Refusal skills are necessary to avoid participating in behavior such as drinking alcohol, using drugs or similar that are not correct or have negative consequences. This means refusal skills focus on ways of assertively refusing or saying no when someone is trying to convince you to participate in a high-risk behavior or behavior you do not accept.
According to this, the one that is not an example of applying refusal skills is "I'll have just one drink" because in this case, you are not refusing to drink or making clear you will not participate, which means you are not applying refusal skills. Also, after taking one drink you might continue drinking more and therefore participating in high-risk behavior.