Concept:The Economic Commission for Africa exists to foster economic cooperation, especially through expanded trade among African countries.
Explanation:The Economic Commission for Africa was established in 1958 as a United Nations commission.
Its main objective is to promote the economic and social development of African states.
A central part of that mission is encouraging intra-African trade.
The Commission helps member states reduce tariffs, quotas, and other trade restrictions.
It also supports regional integration through economic communities and joint development plans.
Thus, removing barriers that limit trade between African nations is one of its recognised achievements.
This achievement is best captured by the first option.
Answer:A. eliminating trade restrictions among states.