单项选择题

下列程序的运行结果是( )。
s=0:t=0:u=0
For x=1 To 3
For y=1 To x
For z=y To 3
 s=s+1
Next z
t=t+1
Next y
u=u+1
Next x
Print s;t;u

A.3 6 14
B.14 6 3
C.14 3 6
D.16 4 3