The correct options are
B androecium
D gynoecium
The four whorls of a flower are calyx, corolla, androecium and gynoecium.
Androecium and gynoecium are the reproductive whorls of the flower.
Androecium represents the male reproductive part of a flower and it produces pollen grains which contain the male gametes.
Gynoecium represents the female reproductive part of the flower and it produces the female gamete, i.e. egg.