Which one of the following plants shows a very close relationship with a species of moth, where none of the two can complete its life cycle without the other?

The plant Yucca shows a mutualistic relationship with the moth Colpa aurea. Both can't complete their life cycle without each other. The moth lays its egg inside the ovarian cavity of the plant and in return, the plant gets pollinated as the moth visits another flower for laying eggs. Young seeds of Yucca are the source of food for the larvae of the Moth. So, the correct answer is Yucca.