In the Indian System of Numeration, 1 lakh is equal to 1,00,000 (one hundred thousand). In the International System of Numeration, 1 million is equal to 1,000,000 (one thousand thousands). To find how many lakhs make one million, we can divide 1 million by 1 lakh: $\frac{1,000,000}{1,00,000} = 10$ Therefore, 10 lakhs make one million. Option B is correct. Options A, C, and D represent incorrect conversion factors.