6. Which situation illustrates quadratic equation?
A. The length of a rectangular board is 3m longer than its width and its perimeter is 25m.
B. Joey paid at least P2,000 for the shirt and pants. The cost of pants is P700 more than the shirt.
C. A garden's length is 7m longer that its width and the area is 18 square meters.
D. A lot cost P4,000 per square meter and the area is 120 square meters​