For any 3 given numbers, which of the foll

问题：

For any 3 given numbers, which of the following is always equivalent to adding the 3 numbers together and then dividing the sum by 3 ？（）
Ⅰ. Ordering the 3 numbers numerically, from highest to lowest, and then selecting the middle number.
Ⅱ. Dividing each of the numbers by 3 and then adding the results together.
Ⅲ. Multiplying each number by 6, adding the resulting products together, and then dividing the sum by 9.

A. Ⅰ only

B. Ⅱ only

C. Ⅰ and Ⅱ only

D. Ⅱ and Ⅲ only

E. None of the above