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答案：
B
某个学校
条件一：如果安排3n个学生到m个教室，那么可以做到每个教室里的人数都一样。
条件二：如果安排13n个学生到m个教室，那么可以做到每个教室里的人数都一样。
解析：
条件一说明3n能够被m整除，那么m可能值有4,5,6,7,8,9,10,11,12，其中6,9,12均是3的倍数，3n/m可约分，导致3n/m的整除与n/m的整除之间没有必然联系。例如，m=6，n=16，3n/m=8，但是n/m=8/3，不能整除，所以（1）不充分；
条件二说明13n能够被m整除，那么m可能值有4,5,6,7,8,9,10,11,12，没有13这个因子，且13是质数，所以13n/m无论m为何值均不能将13约分下去，这就导致了若想13n/m是整数，则n/m必须是整数。所以（2）充分。
选B
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