Case I: This is not necessarily
true because all the members in the club could be 11.
Case II: This is not necessarily
true because if the members are 10, 11, and 13, the median is still 11.
Case III: The mode is
the most frequent number. This is not necessarily true because if
the members are 9, 10, 11, 12, and 12, the median is still 11, but the
mode is 12.
None of the cases hold true, so the answer is A.