A website administrator is considering using one of the two models above to predict the total number of purchases, P, made x weeks after the website's advertisin(g campaign begins. How many more purchases are predicted by the exponential model than by the linear model 5 weeks after the advertising campaign begins?

P = 2000x
P= 500(2^x)

A. 6000
B. 8000
C. 10,000
D. 16,000