Definition: You are given a question on college physics. 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: If the total energy of a particle of mass m is equal to twice its rest energy, then the magnitude of the particle’s relativistic momentum is
(A)mc/2 (B)mc/(2^(1/2)) (C)mc (D)(3^(1/2))mc

D