How can congressional power to investigate provide for checks and balances among the branches of government

Congress can use its powers to investigate to oversee the operations of various agencies of the executive branch

Explanation:

The congressional power is givne to the congress, and it is very important to prohibit a dictatorship fmor happening or a branch of the government to become too powerful that the other two can´t do anything against it, among the powers of the congress you can find the fact that they can oversee the agencies of the executive branch, and they can even remove the President of the United States balancing the branches of government, through a process called impeachment.

the answer your looking for is c. : )