A rectangular piece of land is to be divided into 6 square regions of equal size. On a map, the length of the entire piece of land measures 9.6 inches, and the width measures 6.4 inches. The scale of the map is 15 inch=15 feet. How much area will be included in each region when the piece of land is divided?
a . 32,400 square feet
b . 57,600 square feet
c . 86,400 square feet
d . 129,600 square feet
