How are commercial services and direct services interrelated?

(A) Commercial services depend on direct services
(B) Buying and selling are examples of direct services
(C) Direct services include advertising, accounting and medical services
(D) Tertiary production consists of commerce and direct services

The answer is: (D) Tertiary production consists of commerce and direct services

The international organization UNCTAD is United Nations Conference on

(A) Transportation and Demand
(B) Trade and Development
(C) Tariff and Demand
(D) Tariff and Deployment

The answer is: (B) Trade and Development
The United Nations Conference on Trade and Development (UNCTAD) is an intergovernmental organization to promote the interests of developing countries in world trade.