Answer: The correct answer is C) Genetic mutations.
Genetic mutation is the permanent change in the genetic material of the organism. It can be caused by error in the process of DNA replication as well exposure of genetic material with the environmental or chemical agents, which are called mutagens.
For example- Chemical agents like bromine, sodium azide and radiations like X- ray can cause change in the genetic material.
Virus can also result in mutation by integrating the genetic material into the genome of the host cell.
Thus, option C) is the right answer.