[单选题]
A proton strikes an ox,oo1lx 9k:j+ jlxz5l;axrb:kye(y9 nrh .(zongen-18 nucleus producing fluorine-18 and another particle. What oth(9znhe .(nor yer particle is produced by this nuclear reaction?
A. a neutron
B. an $\alpha$ particle
C. an $b-$ particle
D. an $b+$ particle
