Which of the Following Is a Difference Between Merchandise Trade

Which of the following is a difference between merchandise trade and service trade?

A) Merchandise trade takes place only between a firm and a consumer,whereas service trade takes place only between a producer and a consumer.
B) Merchandise trade includes services and foreign direct investment,whereas service trade includes only trade in goods.
C) Merchandise trade is the buying and selling of tangible products,whereas service trade is the buying and selling of intangible services.
D) Merchandise trade is defined by the Four Modes of Supply of the General Agreement on Trade in Services (GATS) ,whereas service trade is defined by the Four Modes of Demand of the GATS.