问题如下：
From a list of 50 funds, a portfolio manager wants to select 15 funds and invest them for the next year, which principle of counting will he choose?
选项：
A.Labeling
B.Multiplication rule
C.Combination
解释：
C is correct. The principle of combination means the act of arranging elements into specified groups without regard to order.
请问每个基金的收益都不同那不是标签就不同不能用combanation 要用 labelling吗，为什么是选combanation呢
