The WTO Requires Its Members to Operate Under Various Rules

The WTO requires its members to operate under various rules. Which of the following are included in these rules?

A) Tariffs must be reduced, but quota agreements are permitted.
B) Any national benefiting from a tariff reduction by another country must reciprocate by making similar tariff reductions itself.
C) Any trade concession that a country makes to one member must be granted to all signatories.
D) WTO- sanctioned retaliatory action is permitted in response to unfair barriers to trade.
E) B and D
F) A and B
G) C and D