The letter "V"
It is: Y
T. The sequence is the first letter of the numbers one, two, three...
The next letter is L. Here is the sequence: a _ _ de _ _ hi _ _ lm.
When you answer sequence questions, look for a repetition anywhere. We can see that the first letter and the last letter is an 'F' so the sequence must be FHEXFHEXF.... so your answer is F.
D The letter sequence is the months of the year in order from January. December would end the sequence