Oversight can best be described as the a. efforts of Congress to supervise the manner in which its laws are implemented by the executive branch. b. authority of committee chairs over the hearings and investigations conducted by the subcommittees. c. approval that the Senate must give to all presidential appoi

Option(a) is correct option

Explanation:

Oversight is the mechanism in which monitoring and reviewing is done on power ,programs, task,implementation and making policies etc by Congress.This oversight is kept by U.S. Congress upon executive branches .

Other options are incorrect because power of committee over sub-committee for hearing and cases and Senate's approval for presidential appointment are not regarded as oversight. Thus, correct option is option(a).

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explanation: