The correct option is D haploid, haploid
Gametes are always haploid in nature.
A diploid parent body undergoes meiosis to produce gametes which are haploid in nature. This is seen in all diploid organisms except lower organisms with predominant haploid gametophytic stage or parent plant body such as algae.
Organisms which have haploid parent body, undergoes mitosis to produce gametes which are also haploid in nature.