A ?⁺ and ?^- at Rest Annihilate to Produce Two

Multiple Choice

A ?⁺ and ?^- at rest annihilate to produce two gamma rays that fly in the opposite directions. What is the wavelength of each gamma ray? The rest energy of a muon is 106 MeV and
H = 6.63 × 10^-34 J·s.

A) 1.17 × 10^-14 m
B) 5.85 × 10^-15 m
C) 2.92 × 10^-15 m
D) 1.46 × 10^-15 m