What is the greatest expense for the state of Oklahoma?
a. healthcare for the people
b. police protection
c. government leaders' salaries and pensions
d. education for children and adults

The greatest expense of the state of Oklahoma is the healthcare for the people.

Explanation:

Oklahoma is a federal state in the United States. As all states, it has its own governing bodies, its own policies, budget, and of course its own projects and expenditures.

There are variations between the states in the United States when it comes to their expenditure as in what sector they spend the most, but one sector that seems to always be at the top is the healthcare, and Oklahoma is not an exception. In fact, the healthcare is the biggest expense of Oklahoma, accounting from around 7 billion USD annually.

The second biggest expense of this state is the education, with the government spending around 5 billion USD on it. The pensions come in third with around 3 billion USD, and right behind them are the transportation and the welfare each accounting from around 2 billion USD annually.

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the answer to your question is c