If a total cost curve is plotted; marginal cost can be illustrated by the?

A. slope of the tangent to the curve at any given output
B. U-shaped curve cutting the total cost curve at its lowest point
C. straight line from the origin to the mid-point of the curve
D. straight line cutting the curve at its highest point

Correct Answer:

Option B = U-shaped curve cutting the total cost curve at its lowest point