Explanation: 1- The sequence is increasing, this means that the ratio is a number greater than one (option A is excluded) 2- The sequence is all positive. This means that the ratio is a positive number (option D is excluded) 3- We can note that: 5 * 3 = 15 15 * 3 = 45 45 * 3 = 135 Each time we multiply by 3.