[单选题]
A proton strikes an oxygen-18 nu dsiw*8zh(wsj4jvkx7 u0e h+;9cnhl 3cleus prodq nn0 zx0;dj g6f)pz:zucing fluorine-18 and another particle. What other particle is produznn0jfg zzq :d;0x6)p ced by this nuclear reaction?
A. a neutron
B. an $\alpha$ particle
C. an $b-$ particle
D. an $b+$ particle
