What is the theory of value-trabajo according to Ricardo?

I - The value of goods depends on their scarcity.
II - The value of goods depends on the amount of work and capital used in their production.
III - The value of goods depends on their usefulness.
IV - The value of goods depends on the amount of money paid for them.
a) I and III are correct.
b) II and IV are correct.
c) II and III are correct.