下列哪个代码不能输出’My name is John, I am 21 years old.’

A、'My name is %s, I am %s years old.’ %(‘John’,21)
B、'My name is %s, I am %s years old.’.format(21,’John’)
C、

'My name is {1}, I am {0} years old.’.format(21,’John’)

D、'My name is {name}, I am {age} years old.’.format(age=21,name=’John’)