UPSC Prelims 2023 question on Orangutan Tool Use

In animal tool use, the physical aspects of mediation are easy to see: a chimpanzee might use its hand to strike a surface with some force; if the chimpanzee strikes with a stone in its hand, the force is amplified. An orangutan might reach into a hole with its finger; a stick held in its hand will reach farther or into narrower openings — making it useful for scraping insects from a hole in a tree or a log of wood.

Hence option (b) — Orangutan — is the correct answer.