in its fangs
in its stomach
in a gland behind its eyes
Correct!
Venom is made and stored in a venom gland behind its eyes. When the snake strikes, a muscle behind the gland contracts, and the venom shoots from the gland into the hollow fangs.
Gaboon viper
There are more than 250 kinds of vipers, a family of venomous snakes. The largest of all is the Gaboon viper. At six feet long, this massive viper is a ferocious predator that hunts birds, frogs, and many small mammals in the tropical forests of Africa. When the Gaboon viper strikes, its huge fangs deliver a toxic venom that destroys its victim's nerves, tissues, and blood cells. Its prey escapes but not for long.