World Trade Organization (WTO) is an intergovernmental organization that regulates international trade, was officially commenced on . . . . . . . . under the Marrakesh Agreement.

Answer: Option B

World Trade Organization (WTO) is an intergovernmental organization that regulates international trade, was officially commenced on 1^st January 1995 under the Marrakesh Agreement.
The World Trade Organization (WTO) is an intergovernmental organization that regulates and facilitates international trade. Governments use the organization to establish, revise and enforce the rules that govern international trade.
It officially commenced operations on 1^st January 1995, under the 1994 Marrakesh Agreement, thus replacing the General Agreement on Tariffs and Trade (GATT) that had been established in 1948.