The correct option is C Nepenthes
A species of animal or plant that is seriously at the risk of extinction is said to be endangered.
Nepenthes, commonly known as the pitcher plant, is a carnivorous species that is currently endangered.
Cuscuta is a genus of about 100–170 species of yellow, orange and red parasitic plants.
Acacia nilotica is a tree that grows in the tropics.