Answer:
Option A
Explanation:
Clearly, we observe the following partern : The first letters follow the pattern +3 i.e.
B+3→E,E+3→H,H+3→K
The second letters follow the pattern +2 i.e. M+2→O,O+2→Q,Q+2→S
The third letters follow the pattern + 2 i.e. O+2→Q,Q+2→S,S+2→U
Thus, the missing term is KSU. Hence, the answer is (a).