1.  DF, GJ, KM, NQ, RT, ?

A. UW
B. YZ
C. XZ
D. UX
E. YA

Answer: Option D

Explanation:

There is a gap of one letter between both the letters of first term, a gap of two letters between both the letters of second term and again a gap of one and two letters between the letters of third and fourth terms respectively.

Beside, the last letter of each term and the first letter of next term are in alphabetical order.