选择题
2015 AMC 8 Problem 22: Rows of Students
On June 1, a group of students stands in rows with 15 students in each row. On June 2, the same group is in one long row. On June 3, just one student is in each row. On June 4, the group stands with 6 students in each row. This continues through June 12 with a different number of students per row each day, but on June 13 they cannot find a new way. What is the smallest possible number of students?
2015 AMC 8 第22题：学生排
6月1日，一群学生站成一排，每排15名学生。 6月2日，同一群人排成一长排。 6 月 3 日，每排只有一名学生。 6月4日，该小组每排有6名学生。这种情况一直持续到 6 月 12 日，每天每排的学生人数都不同，但到了 6 月 13 日，他们找不到新的出路。最少可能的学生人数是多少
A.
21
B.
30
C.
60
D.
90
E.
1080