Definition: You are given a question on astronomy. Astronomy is a natural science that studies celestial objects and phenomena. You are also given 4 answer options (associated with "A", "B", "C", "D"), out of which only one is correct. You need to answer the question by selecting the correct option. You should only answer with the choice letter, not the whole answer.
Input: As the life of a star progresses heavy elements are produced. The elements form layers around the star in this order (starting from the outer layer):
(A)H → He → Li → N → O → Si → Fe (B)H → He → C → O → Ne → Si → Fe (C)H → He → Li → O → Ne → Si → Fe (D)H → He → C → N → O → Si → Fe

B