A store owner tracks the number of online orders she receives each week since the start of a new advertising campaign and graphs the data. Use the graph to select the true statement about the function that models the given situation. A. The function is linear and is growing by equal differences over equal intervals. B. The function is exponential and is growing by equal percentages over equal intervals. C. The function is exponential and is growing by equal differences over equal intervals. D. The function is linear and is growing by equal percentages over equal intervals.