- ACKUG
- BDKUH
- CCKUH
- DCJUH
Step-by-Step Solution
The letters are shifted by +1, +2, +3, +4 in order: F+1=G, R+2=T, O+3=R, G+4=K. Applying to BIRD: B+1=C, I+2=K, R+3=U, D+4=H, giving CKUH.
Answer: C) CKUH
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