[单选题]
A proton strikes an oxygen-18 nucleus producing jrv+qv,3*vi s+ ikne3 fsu:da jeace,jx e1) h3;qee)0luorine-18 and another particle. What other particle is produced by t s :e3 aae1qje;x)0d ,)heucejhis nuclear reaction?
A. a neutron
B. an $\alpha$ particle
C. an $b-$ particle
D. an $b+$ particle
