Alison and her dad are going on a hike. how can they best protect themselves from sun exposure? by wearing short-sleeved shirts and shorts by applying sunscreen with a minimal spf by hiking in the middle of the day by wearing protective clothing

By applying sunscreen and by wearing protective clothing.

Explanation:

Protective clothing such as long-sleeved shirts are good for preventing the sun from touching your skin and possible causing sunburns. Sunscreen is also an effective way of preventing sunburns, although it is more versatile as it can be applied to your face and other parts of the body not covered by protective clothing.

By applying sunscreen

Sunscreen is an effective way of preventing sunburns, although it is more versatile as it can be applied to your face and other parts of the body not covered by protective clothing.

she forgets to repeat her message as often as necessary