Concept:The United Nations is an international organisation that member states, including West African countries, can approach for cooperation and assistance.
Explanation:As full members of the United Nations, West African states gain the right to take part in UN bodies such as the General Assembly and specialised agencies.
They can send delegates, present national concerns, and benefit from UN programmes on health, education, agriculture, and peacekeeping.
Only five great powers hold permanent seats on the Security Council, so option B is not possible for West African states.
The UN does not guarantee appointments to its highest office, and it cannot completely eradicate poverty, so options A and D are not realistic benefits.
Therefore, the main benefit is that member states have greater access to the different organs of the United Nations.
Answer:C. greater access to all the organs of the United Nations.