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What is the running time of naïve matrix multiplication algorithm?

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What is the running time of naïve matrix multiplication algorithm?

(a) O(n^2.81)

(b) O(n^4)

(c) O(n)

(d) O(n^3)

I had been asked this question during an interview.

I'd like to ask this question from Number Theory topic in portion Number Theory of Data Structures & Algorithms II

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Correct answer is (d) O(n^3)

The best explanation: The traditional matrix multiplication algorithm takes O(n^3) time. The number of recursive multiplications involved in this algorithm is 8.

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