I will give brainliest. I will report you if you give me dumb answer
A mutagen is
A.) a living thing that has undergone a mutation.
B.) an agent that causes a mutation in DNA.
C.) a mutation that has affected one gene.
D.) any chemical that can poison living cells.
A mutagen is a chemical or physical phenomenon, such as ionizing radiation, that promotes errors in DNA replication. Exposure to a mutagen can produce DNA mutations that cause or contribute to diseases such as cancer.
