The best option to complete the sentence is "do". This is because the sentence is a question and requires an auxiliary verb to form the question correctly. The word "don't" is incorrect because it would create a negative statement rather than a question. The word "can't" is also incorrect because it means that the person is not able to like mathematics, which is not the same as asking whether they do or don't like it. Finally, the word "can" is also incorrect because it is not a suitable auxiliary verb for forming a question in this context.