Explanation:

- The Industrial Policy of 1956 was a major political initiative by the Indian government aimed at promoting industrial growth and development.

- Schedule A listed industries that were to be the exclusive responsibility of the state.

- Option 1: 16 – This is incorrect, as the list does not have 16 industries.

- Option 2: 17 – Correct Answer. This option correctly identifies the number of industries listed, which was 17.

- Option 3: 10 – Insufficient, as more industries were listed.

- Option 4: 12 – Also incorrect, as again the list was longer.

Therefore, the correct answer is Option 2: 17 industries.

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