<h2>Answer:</h2>
Option A is correct.
A. Congress used legislation to take back power that previous Presidents had assumed.
<h2>Explanation:</h2>
Congress used legislation to take back power that previous presidents had assured this is the example of check and balance that the war power resolution has.
The theory which states that when there are multiple possible explanatons of an event or a phenomenon, the simplest is the best would be Occam's razor.
However, it's important to note that this idea actually states that we shouldn't necessarily multiply ontological entities, which doesn't really mean the easiest solution necessarily.
Popular Sovereignty should be your answer. Have a great day.