[单选题]
A proton strikes an oxygeko/.ar:*f czd n-18 nucleus prodpzl40b+ kjmwlc; b.l8 ucing fluorine-18 and another particle. What other particle is produced by this nuclear reactio lb lb;mkj+.c08z lwp4n?
A. a neutron
B. an $\alpha$ particle
C. an $b-$ particle
D. an $b+$ particle