Michelle is working on a design for a new building. She has built a model of the building according to the client's specifications. The height of the model is 15 inches, the slant height of the model is approximately 17 inches, and the base has a length of 14 inches and a width of 20 inches. Note: picture not drawn to scale. Michelle must order appropriate equipment to heat and cool the building, so she must use the model to determine how much space there will be inside. What is the volume of her model? (Round to the nearest hundredth, if necessary.)
A. 5,600 cubic inches
B. 280 cubic inches
C. 1,400 cubic inches
D. 980 cubic inches