The graph shows Kelsey's annual demand for rental cabins at a state park on the lake. Rate of nightly rentals $160 $120 $80 $40 Demand 3 Number of stays per year What is true if the nightly rental rises from $80 to $120? a. Kelsey's marginal benefit from stays at the park would fall by up to $119.99. b. Kelsey's marginal benefit from stays at the park would fall by up to $79.99 O Kelsey's marginal benefit from stays at the park would fall by $80.00 O d. Kelsey's marginal benefit from stays at the park would fall by less than $80.00