Which type of molecule is directly changed by mutagens? 

A)  carbohydrate 
B)  RNA 
C)  protein 
D)  DNA

Mutagens

Agents that cause mutations or changes in the DNA of organisms, which can lead to genetic diversity or, in some cases, diseases like cancer.

RNA

Ribonucleic Acid, a molecule essential for coding, decoding, regulation, and expression of genes.

DNA

Deoxyribonucleic acid, the molecule that contains the genetic instructions for the development, functioning, growth, and reproduction of all known living organisms and many viruses.