[单选题]
When a positronium atom (electron + positron) decays, it emitf pnyg;bnqsg/78/ss )o6zll40c 2y eu s two photons. Whu ,26/s2x9gxqxpi, savho1y c*-vfwh at are th6 1yufv2xsih2w,v -q,h9sgcpo*xax/ e energies of the photons?
A. 0.511 MeV and 1.022 MeV
B. 0.225 MeV and 0.285 MeV
C. 0.256 MeV and 0.256 MeV
D. 0.511 MeV and 0.511 MeV
