Austria, Indonesia, and Colombia are all members of the WTO. If Austria imposes a tariff on imports of coffee beans from Colombia, but not from Indonesia, is it in violation of WTO principles?
(a) Yes, the WTO prohibits tariffs.
(b) Yes. the WTO prohibits excise taxes.
(c) Yes, Austria is violating the WTO's most favored nation rules.
(d) No. the WTO's most favored nation rules permit Austria to do this.