Foreign Ministry spokesman Hong Lei on Friday again urged Japan to make serious efforts for the improvement of the relationship between the two countries and honestly face up to and____ its history of militarist aggression.

A．look on

B． concentrate on

C．reflect on

D．hold on

有下列程序：
#include＜stdio.h＞
int f(int x，int y)
return((y-x)*x)；)
main()
int a=3，b=4，c=5，d；
d=f(f(a，b)，f(a，c))；
printf("%d\n"，d)；

程序运行后的输出结果是( )。

A．10
B．9
C．8
D．7