The correct option is D Spores
Spore is a reproductive cell capable of developing into a new individual without fusion with another reproductive cell in a favorable condition. As there is no involvement of fusion of gamete or reproductive cell for the formation new individual is called as asexual reproduction.
Zygote is a diploid cell formed by the fusion of male and female gametes. Gonads are organs that produce gametes.
Thus, the correct answer is option B.