The average cost per seat on the $50-$passenger Floating$-$On$-$Air Bus company's trip from Kansas City to St$.$ Louis, on which no refreshments are served, is $$45.$ In advance of a particular trip, three seats remain unsold. The bus company could increase its profit only if it

Group of answer choices

charged any ticket price above $$0$ for the three remaining seats

charged at least $$15$ for each of the three remaining seats

charged at least $$45$ for each of the three remaining seats

paid three people to occupy the three remaining seats