Simple present tense is used to express current / present status or unchanging situations. The given statement is an interrogation regarding the current living place of 'Liz's mother'. The syntax for simple present tense is: do (s/es) with singular subject + subject + verb in its first form, do with plural subject + subject + verb in its first form. Therefore, the correct answer is: Where does your mother live? Option A is in the simple past tense, option B is in the future tense and option D is in the past continuous tense. Given the nature of the question, we would use the simple present tense since we want to know where Liz's mother lives (truth / fact).