Definition: You are given a question on college chemistry. 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: The 13C spectrum of which isomer of C6H14 has lines with three distinct chemical shifts?
(A)hexane (B)2-methylpentane (C)3-methylpentane (D)2,3-dimethylbutane

A