C. If demand is highly elastic, a reduction in the sales price will result in an increase in total sales revenue

Explanation:
In economics, when demand is highly elastic, a decrease in price leads to a proportionally larger increase in the quantity demanded, which can increase total revenue. The other statements are incorrect based on the basic laws of demand and supply. Specifically, an increase in price typically leads to a decrease in demand, and suppliers are generally willing to sell more at higher prices, not less.