In following questions, a sequence of groups of alphabets and numbers is provided with one term missing , Choose the missing term from options. - DEF, HIJ, MNO, ?

Answer: A. STU

The letters in each term are consecutive.
There is a gap of one letter between the last letter of the first term and the first letter of the second term and
a gap of two letters between the last letter of the second term and the first letter of third term.
So, there would be a gap of three letters between the last letter of the third term and the first letter of the fourth term.