Choice A rationale:

 A diet rich in oily and greasy foods is not a recommended prevention strategy for acne vulgaris.

In fact, such a diet may exacerbate the condition in some individuals.

This choice is incorrect.

Choice B rationale:

 Avoiding picking or squeezing acne lesions is a crucial prevention strategy.

Picking can lead to infection, increased inflammation, and scarring.

This recommendation is valid and important.

Choice C rationale:

 Regular exercise as part of a healthy lifestyle can be beneficial for overall health, including skin health.

While exercise alone may not prevent acne vulgaris, it contributes to general well-being, and maintaining a healthy lifestyle can support skin health.

This recommendation is valid.

Choice D rationale:

 Excessive sun exposure without sunscreen is not a recommended prevention strategy for acne vulgaris.

Sun exposure can worsen hyperpigmentation and make scars more noticeable.

This choice is incorrect.

Choice E rationale:

 Gentle cleansing and moisturizing of the skin are essential prevention strategies.

Proper skincare can help maintain skin health and reduce the risk of exacerbating acne.

This recommendation is valid and important.