12. Which of the following situations illustrates quadratic equation?

A. A park lot is 5m longer than its width and the area is 50 square meter.

B. The cost of shoes is 600 more than the socks and Lea paid at least P 1,000.

C. A lot cost P 3000 per square meter and the area is 250 square meter.

D. The length of a rectangular frame is 2m longer than the width and the perimeter is 12m.​