Taxes can be justified if the government uses the revenue to
(i) Provide public goods such as national defense.
(ii) Clean up negative externalities such as water pollution
(iii) Regulate a common resources such as fish in a public lake
(iv) Provide goods with positive externalities such as medical research
a. (ii) only
b. (ii) and (iii) only
c. (i),(ii), and (iii) only
d. (i),(ii),(iii), and (iv)