Answer:
(a) Fig
Explanation:
Figs (genus Ficus) exhibit a unique mutualistic relationship with fig wasps (family Agaonidae). This relationship is highly specialized, with each species of fig tree being pollinated by one or a few species of fig wasps that have coevolved with them. The fig wasp enters the fig through a specialized structure to lay its eggs, and in the process, it pollinates the fig flowers. This intricate relationship ensures the reproduction of both the fig tree and the fig wasp, making it a classic example of coevolution.