(a) Find the slope of the line through (-8, - 3) and (-12, - 19). (b) Based on the slope, indicate whether the line through the points rises from left to right, falls from left to right, is horizontal, or is vertical. (a) Select the correct choice below and, if necessary, fill in the answer box to complete your choice. OA. The slope is (Type an integer or a simplified fraction.) OB. The slope is undefined. (b) Choose the correct answer below. OA. The line is vertical. OB. The line through the points falls from left to right. OC. The line is horizontal. OD. The line through the points rises from left to right.