In the Following Import Graph, If Horizontal Supply Line S_m

Multiple Choice

In the following import graph, if horizontal supply line S_m shifts to horizontal line S'_m because of the imposition of a tariff,

A) the situation must be one of a "large" importing country.
B) the tariff must be a specific tariff.
C) the tariff must be an ad valorem tariff.
D) the tariff can be either a specific or an ad valorem tariff.