Final answer:
The fourth event to complete the rectangle should be placed at (2, 4), which matches the x-coordinate of the second event and the y-coordinate of the third event, completing the rectangle.
Step-by-step explanation:
The question involves determining the coordinates for the fourth corner of a rectangle, given three coordinates of historical events on a mural. The first event is at (-2, 2), the second event is at (2, 2), and the third event is at (-2, 4). To form a rectangle, the fourth event should share the same x-coordinate as the second event (since it will be directly across from the first event on the y-axis) and the same y-coordinate as the third event (since it will be directly across from the second event on the x-axis).
Therefore, the coordinates for the fourth event to form a rectangle would be (2, 4), which is option a). This choice has the same x-coordinate (2) as the second event and the same y-coordinate (4) as the third event, thus completing the rectangle.