The correct answer is option d, that is, DNA is located in the nucleus.
DNA that is deoxyribonucleic acid, is a self-replicating substance located in the nucleus and is found in almost all the living species as the prime component of chromosomes. It is considered as the carrier of the genetic information.
It is a molecule comprising of two chains, which coil around each other to produce a double-helix carrier of the genetic data that is used in the development, growth, reproduction, and functioning of all the known living species and various viruses.