A Monopolist Wishing to Increase Its Profit Has Just Discovered

A monopolist wishing to increase its profit has just discovered that lowering its price and selling more output yielded the desired result. Profit increased. Based on this, we can conclude that the cost of the additional production is

A) greater than the revenue from the additional production.
B) precisely equal to the revenue from the additional production.
C) less than the revenue from the additional production.
D) there is no way to answer this because you have not given us the marginal revenue and marginal cost data.