Could you please help me answer this question in the picture

Romeo is buying milk and is choosing between milk in the half-gallon and milk in the gallon. His preferences for milk in each size are given by the indierence curves in the graph. A half-gallon of milk costs $3, and a gallon of milk costs $8. Romeo has $24 to spend on milk. This budget line is shown in the graph. Using the graph, show the change in Romeo's budget line if the cost of a gallon of milk decreases to $4. Quantity of half-gallons O 1 2 3 4 5 6 7 B 9 1 0 Quantity of gallons - Indifference curves - Budget line After the change in price, what is Romeo's optimal consumption bundle for milk? Goods with straight-line indifference curves are 0 complements 0 perfect complements 0 perfect substitutes