单项选择题
运行如下代码,结果是()l=["a",1,"b",[1,2]]print(len(l))
A.3B.4C.5D.6
A.efgB.efghC.defD.defg
A.print(s.index(g))B.print(s.index("g"))C.print(s.count("g"))D.print(s.count(g))