单项选择题
What is the result？（）
A.Compilation fails. B.Cannot add Toppings C.The code runs with no output. D.A NullPointerException is thrown in Line 14.
多项选择题 Which two code fragments represent these relationships？（）
多项选择题 Which two code fragments， inserted independently at line 12， will compile？（）
单项选择题 What statement is true？（）
