Explanation:

- In April 2021, Nethra Kumanan made history by becoming the first Indian woman to qualify for the Olympics in sailing.

- Sailing is a sport involving the navigation of boats over water with the use of sails, often competing in races or regattas.

- The modern pentathlon is a multi-sport event that includes fencing, freestyle swimming, equestrian show jumping, pistol shooting, and cross-country running.

- Alpine skiing involves racing down snow-covered hills on skis with fixed-heel bindings.

- Fencing is a combat sport that involves fighting with swords like the foil, saber, or épée.

Given the context:

- Option 3: sailing is the correct answer.

.