Marginal Cost Can Be Calculated As:
A) $\Delta$ TC $\Delta$ Q, Where TC Is Total Cost and Q Is Output

Marginal cost can be calculated as:

A) $\Delta$ TC / $\Delta$ Q, where TC is total cost and Q is output.
B) $\Delta$ VC / $\Delta$ Q, where VC is variable cost and Q is output.
C) the slope of the total cost curve.
D) $\Delta$ TC / $\Delta$ Q, where TC is total cost and Q is output; $\Delta$ VC / $\Delta$ Q, where VC is variable cost and Q is output; and as the slope of the total cost curve.