please help graph asap please

A natural spring runs under land owned by ten people. Each person has the right to sink a well and can take water from the spring at a constant marginal cost of $5 a litre. The table sets out the external cost and the social benefi from watet. Draw the marginal cost curve. Label it. Draw the marginal social benefit curve. Label it. Draw the marginal social cost curve. Label it. The govemment sets a quota on the total amount of water such that the spring is used efficiently. Draw a line to show this quota. Label it. > Draw only the objects spocifod in the questich