An investor has a budget of $$40$ million. She can invest in the projects shown below. If the cost of capital is $8\%,$ what investment or investments should she make?

Initial Investment Cash flow

Project A $$21$ million $$12$ million per year for four years

Project B $$16$ million $$9$ million per year for three years

Project C $$15$ million $$6$ million per year for five years

Project A and Project C

Project A and Project B

Project B and Project C

Project A only