Cell division is the process by which the fundamental unit of life, cell, multiplies (or increases in number). Gonads are the reproductive organs of animals/humans.
Mitosis (A) is normal division characteristic of somatic cells. In this division, the daughter cells have the same number of chromosomes as the parent.
Binary fission (C) is a cell division seen in microbes and can be deemed as a form of asexual reproduction. The fully grown parent cell just splits into two new cells.
Asexual division (D) of cells can be of several types (including binary fission, as described above). This division does not involve gonads.
Therefore, options A, C and D are incorrect.
Gonads are typically characterized by meiosis (B), a cellular division in which chromosome numbers are halved in the daughter cells. This enables the formation of haploid gametes, which can fuse to form the constant chromosome number of the original parent cell.
Therefore, option (B) is correct.