Final answer:
Over 90 countries have adopted the United Nations Convention on Contracts for the International Sale of Goods (CISG).
Step-by-step explanation:
The correct answer is b) Over 90 countries have adopted the United Nations Convention on Contracts for the International Sale of Goods (CISG). The CISG is a treaty that establishes a uniform framework for international sales contracts, providing rules and regulations for the rights and obligations of buyers and sellers in cross-border transactions. Some examples of countries that have adopted the CISG include the United States, Germany, China, Brazil, and Russia.