B. 2
Explanation: This question is testing your ability to determine slope for a linear line. Slope can be found by using the rise over run formula, which states the (y2-y1)/(x2-x1). The line in this graph passes through (1,9) and (2,11). Therefore, y2 = 11 and y1 = 9 and x2 = 2 and x1 = 1. Plug these values into the formula: (11-9)/(2-1)= 2/1
