Under the WTO agreement: a. tariffs are permitted to be levied by developed countries against developing countries but not against each other
b. a dispute resolution mechanism allows countries to bring grievances to the WTO against countries that levy inappropriate trade discrimination measures
c. there is no dispute resolution mechanism except for trade involving environmental products
d. countries are allowed to place trade barriers on member countries with no particular justification, because like GATT the WTO has no enforcement mechanism

Under the WTO agreement:

b. a dispute resolution mechanism allows countries to bring grievances to the WTO against countries that levy inappropriate trade discrimination measures.

Explanation:

The WTO (World Trade Organization) Agreement is an international legal framework covering about 63 agreements affecting trade in goods, services, intellectual property, standards, investment, and other issues with some impacts on world trade.  The legal framework is a system of rules that supports open, fair, and undistorted trade competition, allowing tariffs and some protections.

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