Grace Co. can further process Product B to produce Product C. Product B is currently selling for $20 per pound and costs $14 per pound to produce. Product C would sell for $39 per pound and would require an additional cost of $9 per pound to produce. What is the differential revenue of producing and selling Product C? Oa. $39 per pound Ob. $25 per pound Oc. $19 per pound Od. $30 per pound