Solution:We put all the option in blank area and check who create particular pattern
X _ ALZH _ L _ KALDNA _ QAL
FBPSB โ X F A L / Z H B L / P K A L / D N A Sย / B Q A L
FABLE โ X F A L / Z H A L / B K A L / D N A L / E Q A L
EBFLA โ X E A L / Z H B L / F K A L / D N A L / A Q A L
But,
EABLF โ X E A L / Z H A L / B K A L / D N A L / F Q A L
1st letter is increasing by 2 and 2nd letter is increasing by 3. The 3rd and 4th letters are not changing.
Hence, "EABLF" is the correct answer.