Answer the q/a, no need explanation.

1. Which of the following statements is correct?

(a) A public good is non-excludable, but rivalrous.

(b) A public good is efficiently provided when everyone's marginal utility from the good is equal to the marginal cost of the good.

(c) A public good is non-rivalrous, but excludable.

(d) A public good is efficiently provided when the sum of everyone's marginal utilities from the good is equal to the marginal cost of the good.

2. In the following graph if production of good X rises by 1 unit and that of good Y falls from 17.5 to 15 units then marginal opportunity cost of X is:

Y 17.5 15 29 30 X