The answer is N for November.
because
M=March
A=april
M=may
J=June
J=July
A=August
S=september
O=October
and then N=November
k comes next, and then l.
e
u n p
It's K!
Check out the link for the sequence.
N for november. The sequence starts with march.
n for November
d
N Neptune planets out from Sun E is Earth, for example
m for march october november december january february
D
a