Answer:
The correct option is;
A) Ultraviolet light exposure through sunlight is beneficial in moderation but excessive exposure can be extremely damaging.
Step-by-step explanation:
From the passage, it is stated that the negative effects include the results of extreme exposure, such as weakening of plastics, fading of colors, cause sunburn and skin cancer. All he listed negative effects re the results of exceeding a predetermined amount of exposure to the ultraviolet radiation.
Therefore, Holly is expected to conclude that if she must benefit from ultraviolet rays, she would limit her exposure, which means option (A).