单选题
下列代码的执行结果是？（）
mylist=['Failure','is','the','mother','of','success']
for x in mylist[:]:
if len(x)<=3:
mylist.append(x)
print(mylist)
A.
['Failure','is','the','mother','of','success']
B.
['Failure','is','the','mother','of','success','of','is']
C.
['Failure', 'is', 'the', 'mother', 'of', 'success', 'is', 'of']
D.
['Failure', 'is', 'the', 'mother', 'of', 'success', 'is', 'the', 'of']
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