Question

which is a long-term effect of sun exposure?
a bright red rash after sitting in the sun
a stinging burn that is sensitive to touch
a change in skin complexion or sallowness
a cluster of freckles appearing on the skin

Explanation:

A bright red rash, a stinging burn, and a cluster of freckles are relatively short - term or immediate effects of sun exposure. A change in skin complexion or sallowness (a yellowish or unhealthy - looking skin tone) is more likely to be a long - term effect as it can result from cumulative damage to the skin over time from repeated sun exposure.

Answer:

a change in skin complexion or sallowness