Meow! Mmmm...A!
E!! (By the sequence shift)
... a
The lower horizontal line shall be the whole of black and there are a couple of factors, but the answer to this puzzle is F or D. After 4 min considerations I would say F! but I'm not 100% sure.
a
What can it possibly be? :D
Found It! the answer is A!
A
Meow! Mmmm...A!