The answer is B. The line is horizontal. If the line was a regular diagonal slope line with a slope of 1, 2, etc., the answer would be A. If the slope was undefined, the line would be vertical. Since the slope is 0, the line doesn't increase in height or have a slope at all. It is simply a straight, horizontal line.
I hope this helps :)
CPD because of the angle bisector theorem
I believe the answer is the distributive property.
Y + 1 = 6 ( x - 6 )
hope this helps!