The correct option is D Green glands- prawn
Prawns have green glands for excretions. There are pair of green coloured organs which serves as the excretory organs in the group of Crustaceans. These glands open at the base of the antennae. These glands are also called as maxillary or antennal glands. They acts like the kidneys in vertebrates. They help in eliminating wastes and regulation of ions in these organisms.
Thus, the correct answer is option D.