【单选题】下面代码的执行结果是()。 ls = ['2020', '20.20', 'Python'] ls.append(2020) ls.append([2020, '2020']) print(ls)
A.
['2020', '20.20', 'Python', 2020, 2020, '2020']
B.
['2020', '20.20', 'Python', 2020]
C.
['2020', '20.20', 'Python', 2020, [2020, '2020']]
D.
['2020', '20.20', 'Python', 2020, ['2020']]