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]

B.[‘2020’,‘20.20’,‘Python’,2020,[2020,‘2020’]](正确答案)

C.[‘2020’,‘20.20’,‘Python’,2020,[‘2020’]]

D.[‘2020’,‘20.20’,‘Python’,2020,2020,‘2020’]