Overexposure to certain wavelengths of strong sunlight is the main cause of melanoma, a virulent form of skin cancer....

Ravi April 24, 2020

Let's take a look at (A).

(A) says, "There is no evidence that there are wavelengths of sunlight
that lead to both sunburn and melanoma."

We're looking to weaken the argument in the stimulus. (A) tells us
that there isn't a reason to think that the sunburn and melanoma are
from the same waves. From this, we have reason to think that if
someone has a sunblock that is blocking the sunburn rays, it still
might not be blocking the cancer rays. Thus, (A) weakens the argument
and is the correct answer choice.

Does this make sense? Let us know if you have any other questions!

medasmx@protonmail.com November 19, 2021

i think (E) is better in that it suggests that the chemicals in sunblock could cause melanoma.