有如下程序：
#inCluDE ＜iostrEAm＞
using nAmEspACE stD;
ClAss tEst
puBliC:
tEst() n+=2;
～tEst() n-=3;
stAtiC int gEtnum()rEtum n;
privAtE:
stAtiC int n;
;
int tEst:: n=1;
int mAin()
tEst*p=nEw tEst;
DElEtE p;
Cout＜＜"n="＜＜tEst:: gEtnum()＜＜EnD1;
rEturn 0;
;
执行后的输出结果是______.
A．n=0
B．n=1
C．n=2
D．n=3