The ames test is a procedure for

A. Testing disinfectants
B. Pregnancy Testing
C. Antibiotic Sensitivity Testing
D. screening potential carcinogens using bacteria
I think that it is D

D is correct

A test for determining if a chemical is a mutagen. Named for its developer, Bruce Ames.

The use of the Ames test is based on the assumption that any substance that is mutagenic for the bacteria used in his test may also turn out to be a carcinogen; that is, to cause cancer. Although, in fact, some substances that cause cancer in laboratory animals (dioxin, for example) do not give a positive Ames test (and vice-versa), the ease and low cost of the test make it invaluable for screening substances in our environment for possible carcinogenicity.

The bacterium used in the test is a strain of Salmonella typhimurium that caries a defective (mutant) gene making it unable to synthesize the amino acid histidine (His) from the ingredients in its culture medium. However, some types of mutations (including this one) can be reversed, a back mutation, with the gene regaining its function

This ia a test used for detecting chemicals with carcinogenic potential. So I would go with D)