If a production function exhibits diminishing marginal product the slope of the corresponding total-cost curve ?

A. the change in the equilibrium quantity to be ambiguous and the equilibrium price to fall.
B. the equilibrium quantity to rise and the equilibrium price to rise
C. the equilibrium quantity to rise and the change in the equilibrium price to be ambiguous
D. the equilibrium quantity to rise and the equilibrium price to fall
E. the equilibrium quantity to rise and the equilibrium price to remain constant