The correct option is D Capacitation
Capacitation refers to the physiological changes that spermatozoa undergo in order to be able to penetrate and fertilise the egg.
The sperm head has acrosome which lies beneath the plasma membrane.
The plasma membrane and the acrosome fuse together so that the glycoprotein layers are removed and the receptors are exposed which are necessary for the recognition of proteins on the ovum for the purpose of successful fertilisation.
Ejaculation is the release of the semen from the male body.
Spermatogenesis is the process by which haploid spermatozoa develop from immature germ cells in the seminiferous tubules of the testes.
Spermiation is the process by which sperms are released from the seminiferous tubules.