程序段的执行结果是（）#include <iostream>using namespace std;void fun1(int &x) {    x++;}void fun2(int x) {    x++;}int main() {    int abc = 100, xyz = 13;    fun1(xyz);    abc = xyz;    fun2(abc);    printf("%d\n", abc);}

• A.100

• B.13

• C.12

• D.14