A plastics factory emits water pollutants into a nearby river. The marginal private cost of producing plastics is constant, the marginal external cost of the pollutants increases with the quantity of plastics, and the demand for plastics is downward sloping. What happens to the socially optimal level of output and market price if the marginal external cost curve shifts upward?

A) Optimal price and quantity decrease.
B) Optimal price increases, optimal quantity remains unchanged.
C) Optimal price increases, optimal quantity decreases.
D) Optimal price and quantity decline.

When purchasing from offshore suppliers,buyers might expect delays resulting from:

A) transportation in the supplier's country.
B) domestic customs clearance.
C) the time the goods are in port.
D) transportation in the supplier's country and domestic customs clearance.
E) transportation in the supplier's country,domestic customs clearance and the time the goods are in port.