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If 'TABLE' is 'UBCMF', then 'CHAIR' is:
DIBSJ
DIBJS
DIBSI
DIBIS
DIBSJ
Observe the simple positional shift: every letter in the word is replaced by its immediate successor in the English alphabet (N+1 rule).
Observe the simple positional shift: every letter in the word is replaced by its immediate successor in the English alphabet (N+1 rule).
Analyze the pattern
Compare TABLE to UBCMF: T+1=U, A+1=B, B+1=C, L+1=M, E+1=F. The pattern is a consistent shift of +1 for every letter position.
Apply pattern to CHAIR
Apply +1 to each letter: C+1=D, H+1=I, A+1=B, I+1=J, R+1=S. The final string is DIBJS.
Option A is DIBSJ (incorrect last letter), Option C is DIBSI (incorrect last letter), Option D is DIBIS (incorrect sequence).
B is correct because applying the +1 alphabetical shift to each letter of CHAIR results in D-I-B-J-S.
Always verify the last letter of your decoded word first; often, the difference between options lies in the final 1 or 2 characters.