单选题

运行下列程序,输出的结果是?( )

def fun(a, b):

  s = 0

  a = a[::-1]

  for i in range(len(a)):

    s += int(a[i])*b**i

  return s

print(fun('45', 16))

A

69

B

45

C

64

D

61

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