$[[300,45,13,500],[400,40,16,000],[500,35,17,500],[600,30,18,000],[700,25,17,500],[800,20,16,000],[900,15,13,500],[1,000,10,10,000],[1,100,5,5,500],[1,200,0,0]]$

Refer to Table $17-1.$ If Rocielle and Alec operate as a profit$-$maximizing monopoly in the market for water, how much profit will each of them earn, assuming that the two producers split the market equally?

a$.$ $$8,750$

b$.$ $$12,000$

c$.$ $$18,000$

d$.$ $$9,000$