1.  ATTRIBUTION, TTRIBUTIO, RIBUTIO, IBUTI, ?

A. IBU
B. UT
C. UTI
D. BUT
E. None of these

Answer: Option C

Explanation:

In the first step, one letter from the beginning and one from the end of a term are removed to give the next term. In the second step, two letters from the beginning of a term are removed.

These two steps are repeated alternately.