Answer
A - permissible
B - not permissible
C - not permissible
D - permissible
E - not permissible
Work Step by Step
A - permissible
B - l can be as large as only n-1
C - n starts at 1 (n does not start at 0)
D - permissible
E - $m_{l}$ 's magnitude can not be greater than l's magnitude