下列哪个程序段可能导致错误?A.String s="hello"; String t= "good"; String k=s+ t;B.String s="hello"; String t; t=s[3]+"one";C.String s="hello"; String standard=s. toUpperCaseD.String s="hello"; String t =s+ "good"

下列哪个程序段可能导致错误?

A.String s="hello"; String t= "good"; String k=s+ t;

B.String s="hello"; String t; t=s[3]+"one";

C.String s="hello"; String standard=s. toUpperCase

D.String s="hello"; String t =s+ "good"


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