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Which one of the following is the tightest upper bound that represents the number of swaps required to sort n numbers using selection sort?

1. O(log n)
2. O(n)
3. O(n log n)
4. O(n²)

Correct answer: O(n)

Solution

Selection sort requires a linear number of swaps, specifically one swap for each of the n elements in the worst case, making O(n) the tightest upper bound for the number of swaps.

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