( a ) acts on the Leydig cells and stimulates secretion of some factors which help in the process of spermiogenesis
( b ) acts on the Sertoli cells and stimulates secretion of some factors which help in the process of spermiogenesis
( c ) acts on the Sertoli cells
( d ) acts on the Leydig cells and stimulates secretion of some factors which help in the process of spermatogenesis