The estrogen is synthesised and secreted mainly by growing ...$A$.... After ovulation the ruptured follicle is converted to a structure called ...$B$... which secretes ...$C$... Choose the correct option for $A, B$ and $C$.

• A
  $A$-corpus luteum,$B$-corpus callosum,$C$-progesterone
• B
  $A$-Graafian follicle,$B$-corpus luteum,$C$-progesterone
• C
  $A$-corpus callosum,$B$-corpus luteum,$C$-estrogen
• D
  $A$-Graafian follicle,$B$-corpus luteum,$C$-estrogen