下面的程序，若想运行结果是Best Wishes to you!，则划线处代码可能是（      ）

s="Happy National Day!"

m=          

if m=="Happy":

    print("Happy to you!")

elif m=="National":

    print("Best Wishes to you!")

else:

    print("It's a fine Day!")

A、s[6:13]

B、s[7:14]

C、s[-6:-14:-1]

D、s[-13:-5:1]