Use the Following to Answer Questions

Multiple Choice

Use the following to answer questions :
Figure 18-4
-Suppose the country, importing oil in Figure 18-4 puts on a prohibitive tariff.The smallest prohibitive tariff would be:

A) $0, since there is no trade at the current price.
B) $5.
C) $10.
D) $20.
E) impossible to determine exactly without more information.