Secondary sexual characteristics develop during puberty and are regulated by

Secondary sexual characteristics develop during puberty and are regulated by
a) neurotransmitters released by the gonads
b) hormones released by the gonads
c) neurotransmitters released by the CNS
d) hormones released by the posterior pituitary gland

In the male reproductive system, Sertoli cells
a) support and nourish developing sperm
b) nourish and remove wastes from testicular neurons
c) store the hormone of maleness; testosterone
d) regulates the secretion of testosterone

The sperm structure, the acrosome, contains
a) numerous mitochondria that supply ATP necessary for sperm locomotion
b) an alkaline fluid that neutralizes the acidity of the urethra and vagina
c) powerful enzymes that are required to assist the sperm to penetrate the layers of the egg
d) the male genetic (DNA) material consisting of 23 chromosomes 
IS THE ANSWER C ?? confused