Please help me answer both these questions for my final coming up!

Supply Curve for Good R Price (dollars per unit) 100 90 BO 70 60 50 40 30 20 10 60 80 100 120 Quantity Refer to the figure above. Which of the following could have caused the shi I in the supply curve? Select one: O A. a technological advancement in the production of Good A 3 B. a decrease in the price of a complement good in production C. a decrease in the cost of producing Good R O D. a decrease in the expected future price of Good R Clear my choice I a firm is experiencing decreasing marginal returns to labor, the firm's production function is Select one Increasing: decreasing decreasing: Increasing inaneasing; Inareasing D. decreasing; decreasing