[单选题]
The Feynman diagram shows two electrons approaching shoei9;l2u (g each other, int1ok s11;z(t8 kj/co t gssfeg;eracting, and then leaving each other. What particle is being exchanged duritj;ssg1 osgzf; 8c/1 k1o te(kng the interaction?
A. pion
B. virtual photon
C. neutrino
D. $W$ particle
