Which expression defines feed cost for an animal?

Which expression defines feed cost for an animal?

• A. Pounds of diet of feedstuff multiplied by cost per unit of that diet, plus pounds of hay fed multiplied by hay cost
• B. Pounds of diet of feedstuff multiplied by diet of feedstuff cost plus pounds of hay fed multiplied by hay cost
• C. Pounds of feed fed multiplied by price per pound
• D. Total feed cost

Answer: (B)