1. The problem asks to identify the location of the origin on the coordinate plane. 2. The origin in a coordinate plane is the point where the x-axis and y-axis intersect. 3. This point has coordinates $$(0,0)$$. 4. From the given points: P(-2,4), M(2,4), N(1,1), O(0,0), Q(-3,0), the point labeled "O" has coordinates $$(0,0)$$. 5. Therefore, the letter that shows the location of the origin is **O**. Final answer: The origin is at point **O** with coordinates $$(0,0)$$.