Answer: Option C
Explanation: The cost can be differentiated on the basis of subject matters as accounting cost and economic cost.
The accounting cost do not consider the opportunity cost while calculating the total cost but the economic cost does. As per the economics, total cost is the sum of explicit cost and implicit/ opportunity cost.
Explicit cost refers to the direct payment made to others while the implicit cost refers to the loss of choosing one alternative over other.
Hence from the above we can conclude that the correct option is C .