Suppose you were to try to create a proton-antiproton pair by annihilation of two very high-energy gamma rays of the same wavelength heading toward each other. The proton and the anti-proton have the same masses, but opposite charges. What would be the minimum energy needed for each photon? (e = 1.60 × 10⁻¹⁹ C, mproton = 1.67 × 10⁻²⁷ kg, c = 3.00 × 10⁸ m/s)
A. 939 MeV
B. 1.022 MeV
C. 12.2 MeV
D. 1880 MeV