Tina has a utility function given by: U (x, y) = y + 5x At one point in time, Tina consumes a unit of x and two units of y. If the consumption of x becomes zero, how many units of y must she consume to be as well off as before? There might be more than one correct answer. Choose your selection carefully. Select one or more: a. 10 b. 8 c. 4 d. 7