Carmen Co. can further process Product J to produce Product D. Product J is currently selling for $23.65 per pound and costs $15.85 per pound to produce. Product D would sell for $41.80 per pound and would require an additional cost of $10.65 per pound to produce. What is the differential cost of producing Product D? a. $8.52 per pound b. $10.65 per pound c. $12.78 per pound d. $6.39 per pound