The set of letters in the box go together in a certain way. Find the set of letters that belongs
where you see the question mark (?) in the box.
------------------------------------------------------------
I BCD CDE DEF I LMN OPQ JKL EFG
I HIJ IJK ? I
------------------------------------------------------------
The set of letters that belongs in place of the question mark (?) in the box is "EFG".
In each set of letters, the first letter is followed by the next two letters in alphabetical order. So, starting with "I", the next two letters would be "J" and "K", which gives us "IJK".