What is the function of the mitochondria in a human sperm?
(A) to release enzymes that break down the membrane surrounding the ovum during fertilisation
(B) to coordinate the movement of the sperm once it enters the female reproductive system after intercourse
(C) to provide the male chromosomes containig genetic information during fertilisation
(D) to provide the sperm with energy so that it is able to swim through the female uterus and oviduct after intercouse