Given：

What is the result？（）

A.test
B.Exception
C.Compilation fails.
D.NullPointerException

A.All of the assert statements are used appropriately.
B.Only the assert statement on line 12 is used appropriately.
C.Only the assert statement on line 15 is used appropriately.
D.Only the assert statements on lines 15 and 18 are used appropriately.

A.23
B.234
C.235
D.Compilation fails.