Definition: You are given a question on high school biology. 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: During which phase of the cell cycle does the quantity of DNA in a eukaryotic cell typically double?
(A)G_1 (B)G_2 (C)M (D)S

D