[单选题]
Particles that do not interac7y8(woyew j 4utja0n/z2o7m r1c ca *sq via the strong force but do interact via the weak nuclear force (and presumably by the much weaker gravitation force) are /za*o2 sm n7a01qcjrc called
A. gauge bosons.
B. leptons.
C. baryons.
D. mesons.
