Concept:OPEC coordinates oil policies among petroleum-exporting countries, and many African nations depend heavily on oil, making them susceptible to OPEC decisions.
Explanation:OPEC is an economic body formed to protect the interests of petroleum-exporting countries.
Several African nations are members of OPEC, and many more African economies rely on oil revenue.
When OPEC changes oil prices or production levels, these African economies feel the impact directly.
Therefore, OPEC has strong influence over African states, which are collectively represented by the African Union (AU).
The other options do not match this relationship as clearly as the AU does.
Answer:D. AU