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答案：B
解析：
The median of five numbers can be found by putting the numbers in increasing order and picking the middle, or third, number from the list. Putting the four numbers you know in increasing order produces the following list:
399，456，508，550
Thus, if n is less than or equal to 456, the list of the numbers in increasing order will be
n，399，456，508，550 or 399，n，456，508，550 or 399，n，456，508 comma550
In either case, the median will be 456. However, if n is greater than 456, the list of numbers in increasing order will be
399，456，n，508，550
or 399，456，508，n，550
or 399，456，508，550，n
In these cases, the median will be either n or 508. Since you know that the median is 456, it must be true that n is less than or equal to 456. Also, since no two games had the same attendance, the number n cannot be equal to 456. Therefore, the greatest possible value of n is 455.
