- AFish
- BFossils
- CReptiles
- DInsects
Step-by-Step Solution
The relation is a branch of study : the creatures it studies. Ornithology is the study of birds; entomology is the study of insects. Every distractor is the subject of some neighbouring branch of study, which is the trap: fish belong to ichthyology, fossils to palaeontology and reptiles to herpetology.
Answer: D) Insects