Answer:
So B has the greatest value of slope.
Explanation:
A has a negative slope, so A is out.
B, C and D all have positive slopes.
B has a greater slope than C, so C is out.
B has a finite slope, and D has a "slope" of infinite, but much of the time it does not count, because we do not make calculations with infinite slopes, and infinity is not a number (value).
So B has the greatest value of slope.