Concept:Nigeria’s influence and claim to leadership in Africa is largely derived from its demographic and physical endowment.
Explanation:Nigeria has the largest population in Africa and a substantial land area, which make it a major continental power.
This huge population gives Nigeria a natural advantage in providing manpower, resources and political weight within African institutions.
Other African nations often look up to Nigeria because of its size, even during continental crises or when seeking assistance.
While military strength, generosity, and economic performance can support Nigeria’s foreign policy, the principal foundation of its leadership ambition is its size and population.
Therefore, the most suitable option among the list is the one about size and population.
Answer:B. size and population