Diminishing marginal returns for the first four units of a variable input is exhibited by the…

Diminishing marginal returns for the first four units of a variable input is exhibited by the marginal product sequence:Select one:a. 50, 50, 50, 50. b. 50, 40, 30, 20. c. 50, 110, 180, 260. d. 50, 100, 150, 200. Feedback