Detailed Explanation:

Answer: Option 3 — Reproductive cloning of animals

Somatic Cell Nuclear Transfer (SCNT) is a cloning technique where the nucleus of a somatic (body) cell from a donor organism is transferred into an enucleated egg cell (an egg whose nucleus has been removed). The reconstructed egg is then stimulated to divide and develop into an embryo, which is implanted into a surrogate mother to produce a genetically identical clone of the donor organism. This process is called reproductive cloning.

Famous example: Dolly the sheep (1996) was the first mammal successfully cloned using SCNT technology. This technology has applications in livestock breeding, conservation of endangered species, and biomedical research. However, it is not related to biolarvicides, biodegradable plastics, or producing disease-free organisms through this specific mechanism.