The correct answer is option C, that is, to regulate all the cellular activity and is found in the Nucleus.
DNA is found in the nucleus of the cell as a nuclear DNA. It is a nucleic acid, which comprises the genetic instructions for the function and development of all the living organisms. All the identified cellular life and even some of the viruses comprises DNA. The prime function of the DNA of the cell is the enduring storage of information in order to monitor all the cellular activity.