问题
Jim is a ____ boy, and today is his _____ birthday.
A:twelve-years-old, twelve
B:twelve-years-old, twelfth
C:twelve-year-old, twelve
D:twelve-year-old, twelfth
B:twelve-years-old, twelfth
C:twelve-year-old, twelve
D:twelve-year-old, twelfth
正确答案是：
