In Reading a Claim by an Atmospheric Scientist That Ozone

In reading a claim by an atmospheric scientist that ozone depletion is not an actual environmental problem,a critical thinker would

A) ignore the claim because it does not align with his/her opinions.
B) feel relieved because ozone depletion was such an overwhelming problem.
C) look for evidence that is in line with past experience.
D) look for evidence and background of the source's reliability.
E) acknowledge the claim because an atmospheric scientist is an expert.