The primary check the president has on Congress is the ability to veto legislation. The president can also choose to implement legislation in a manner Congress did not intend. Executive orders also give the president significant power.
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"c. A narrative source" is what a historian would use to get a firsthand account of a past event, since in these sources (which are also primary sources) a person is giving a first-hand account of the event itself.
B, C and D are the correct answers hope I can help!
