Final answer:
A sovereign wealth fund is a financial institution established by a government to manage its reserves and investments.
Step-by-step explanation:
A sovereign wealth fund is a financial institution established by a government to manage its reserves and investments, often derived from commodity exports or foreign exchange reserves.
It is not a global alliance promoting environmental sustainability (option b), a non-profit organization focused on humanitarian aid and disaster relief (option c), or a regional trade agreement facilitating economic cooperation (option d).