Seasonal Apparel is a fashion retailer chain. In 2012, it opened 126 outlets in different cities. Arya, a sales manager at Seasonal Apparel, has to present the data on the total revenue generated in these 126 outlets over a ten-year period in an attempt to determine regional trends. In this case, which of the following graphics is best suited for Arya's presentation? a. A flowchart b. A photograph c. A pictogram d. A map