[单选题]
Particles that do not f-n*jto(votq:rz:jnb 5j;9 y interaem:y6 ljvm),sct via the strong force but do interact via the weak nuclear force (and presumably by the much weaker gravitatiel6 s:y m,mj)von force) are called
A. gauge bosons.
B. leptons.
C. baryons.
D. mesons.
