Classification – Odd one out (water-based activities vs unrelated): Identify the item unlike the others: Swimming, Sailling, Diving, Driving.

Introduction / Context:
Activity classification can focus on environment or medium. Three activities are water-based; one is a land-based vehicular skill.

Given Data / Assumptions:

• Swimming: human propulsion in water.
• Sailling (sailing): navigating a boat using wind on water.
• Diving: entering/descending into water.
• Driving: operating a vehicle (typically on land roads).

Concept / Approach:
Group by medium: water vs land. The non-water activity is the outlier.

Step-by-Step Solution:
Swimming → water.Sailing → water.Diving → water.Driving → land vehicle operation.

Verification / Alternative check:
Even though some driving can occur on boats (pilotage), conventional “driving” refers to cars/trucks on roads; “sailing” already covers watercraft operation.

Why Other Options Are Wrong:

• Swimming, Sailing, and Diving share a water medium.

Common Pitfalls:
Overinterpreting the misspelling “Sailling”; intent clearly indicates “sailing.”

Final Answer:
Driving