Explanation: Choice a indicates a need for further teaching because salicylic acid is a common ingredient in many acne treatments and is known for its exfoliating and acne-fighting properties. Avoiding skincare products with salicylic acid may limit the client's access to effective acne treatments.

Incorrect choices: b. "I will wash my face twice daily with a gentle cleanser." - This statement is correct as regular face washing with a gentle cleanser can help remove excess oil and dirt, preventing clogged pores and reducing the risk of acne breakouts.

c. "I will change my pillowcase every week to prevent bacterial buildup." - This statement is correct as changing pillowcases regularly can prevent the accumulation of oils and bacteria that can contribute to acne development.

d. "I will avoid touching my face frequently to prevent the spread of bacteria." - This statement is correct as touching the face frequently can transfer bacteria and dirt from the hands to the face, increasing the risk of acne breakouts.