I'm actually fairly certain the answer is d. Counting backwards, the sequence is 4344. But why does it change there? In order to be certain that the pattern is correct, we have to see the pattern repeat or it's meaningless. So why does it change from 4 to 3 in the sequence? Well, it seems that the problem lies in the alphabet itself. Lo and behold, when doing it, only the second time we move (from s to p) do we not encounter a vowel while counting backwards. So instead of using the alphabet, use the consonants only. Then the sequence is 3 3 3 3 and we can easily surmise that the next letter should be d.
A,H,A,L,U,?
what is the next letter e h l q
The next letter is W. (From E to H it skips two letters, then three, then four, so in this case it should skip 5, which gets us to W.)
N, T
T (letters without curves)
a h a l u
H, O, N. T S P and H are the first letters in order for a three sided, four sided and five sided polygon. Triangle. Square. Pentagon and Hexagon. The next polygon is seven sided, a Hexagon. A polygon with eight sides is an Octagon. Lastly, for this puzzle, a nine sided polygon is Nonagon. :)
The next letter is D. The pattern is every fourth letter. Ie. a b c D e f g H i j k L m n o P and so on...
A
L
w s p l h e - because each letter has a gap of 2 in between and go backwardsI cannot see any prominent trend in the second lot. It doesnt look like it'd be a vowel anyway.
The answer is Q. b+1=c, c+2=e, e+3=h, h+4=L, L+5=Q.