You will be given a definition of a task first, then some input of the task.
In this task, you are given two facts, and a multiple-choice question. Based on the given facts, answer the question with index of the correct option (e.g, "A").

Fact1: Sporangia produce spores that develop into tiny, heart-shaped gametophytes., Fact2: Gametophytes of extant genera are green, photosynthetic,and have a long ribbon shaped thallus., Question: Sporangia produce spores that develop into what gametophytes? (A) peachleaf willow (B) green photosynthetic (C) Chlorophyll (D) photosynthesis (E) Most plants (F) graptolites (G) members of their own species (H) in the autumn season
Output:
B