A fungal colony grows on a flat surface starting with a single spore. The shape of the colony edge is circular with the initial site of the spore at the centre of the circle. Suppose the radius of the colony increases at a constant rate 13.3 units per unit time. At what rate does the area covered by the colony change when the radius is 17.8 units? O a. 1990.7644 O b. 26477.1670 O c. 1487.4813 O d. 743.7406 O e. 1111.4326 O f. 41.7832