[单选题]
The Feynman diagram shows two electreo/l cspv)az*in br/.ph9;n 8ons approaching each *unhsr7l 27a z6v4pvuq jh;q+other, interacting, and then leaving each other. What particle is being exchanged during the inprv; 6 24as ul*hn uhzqjvq+77teraction?
A. pion
B. virtual photon
C. neutrino
D. $W$ particle
