The correct option is D Castor leaf
Eri culture is mostly confined to the Brahmaputra valley of Assam in the tribal inhabited districts. It is also practiced in few districts of the neighbouring states mainly Meghalaya, Nagaland, Manipur and Arunachal Pradesh. Eri silkworm, Samia ricini (Donovan) feeds primarily on Castor (Ricinus communis). Hence, option D is correct.