单选题

声明一个方法：提供Student对象数组按照学号升序排列的判断条件：

Question

A. -(NSComparisonResult)compareWithNumberForAscendSort:(Student*)otherStudent

B. -(NSInteger)compareWithNumberForAscendSort:(Student*)otherStudent

C. - (BOOL))compareWithNumberForAscendSort:(Student*)otherStudent

D. +(int)compareWithNumberForAscendSort:(Student