【单选题】

当执行下面代码时，会输出()。

Boolean b1 = newBoolean(true);
Boolean b2 = newBoolean(true);
if (b1 == b2)
if (bi.equals(b2))
System. out.printin ("a");
else
System. out. println ("b");
else
if (bi.equals(b2))
System. out.println ("c");
else
System. out.printIn("d");
A．a
B．b
C．c
D．d