Answer:
D. Meiosis
Step-by-step explanation:
A) Fragmentation
B) Regeneration
C) Budding
D) Meiosis
E) Fission
Sexual reproduction includes the production (meiosis) and fusion (fertilization) of the male and female gametes.
Gametes are produced by meiotic division of diploid sex cells to produce haploid cells. In males, males gametes (sperms) are produce while female gametes (eggs) are produced during the process of gametogenesis.
During fertilization, the haploid male and haploid female gametes fuse together to form a diploid structure known as as the zygote.
Fragmentation, regeneration, budding, and fission even though represent a form of reproduction, they are not sexual in any way.
The correct option is D.