Detailed Explanation:

Answer: Option 3 — Lemongrass

Lemongrass (also known as Citronella grass) is widely used in preparing natural mosquito repellents due to its strong citrus-like odor. The essential oil extracted from lemongrass contains citronella oil, which is highly effective in repelling mosquitoes. Studies have shown that lemongrass oil can repel or kill up to 95% of certain mosquito species, with effects lasting approximately 2-3 hours.

📝 Short Notes: Natural Mosquito Repellents

• Lemongrass (Cymbopogon): Contains citronella oil, the most commonly used natural mosquito repellent; effective against multiple mosquito species
• Mechanism: The strong citrus odor masks human scent and carbon dioxide, making it difficult for mosquitoes to locate their targets
• Citronella Oil: Extracted from lemongrass leaves; used in candles, sprays, lotions, and incense sticks
• Duration of Effect: Typically lasts 2-3 hours; requires reapplication for extended protection
• Other Natural Repellents: Neem oil, eucalyptus oil, lavender, basil, and marigold also possess mosquito-repelling properties
• Safety: Natural repellents are generally safer than chemical alternatives like DEET, with fewer side effects