The Morley-Minto Reforms are popularly known for being introduced through the Indian Councils Act, 1909 (option 2). These reforms were significant in the context of British rule in India.

Option 1, the Indian Councils Act, 1892, is not the correct answer. This act did make some changes to the legislative councils in India, but it did not introduce the specific reforms associated with the Morley-Minto Reforms.

Option 3, the Government of India Act, 1919, is not the correct answer either. Although this act was a major step towards self-government in India, it is not directly related to the Morley-Minto Reforms.

Option 4, the Government of India Act, 1935, is also not the correct answer. This act is known for providing a framework for a federal government in India, but it was introduced much later than the Morley-Minto Reforms.

Therefore, the correct answer is option 2, the Indian Councils Act, 1909, as it is the act primarily associated with the Morley-Minto Reforms.