Grace Co. can further process Product B to produce Product C. Product B is currently selling for $19 per pound and costs $14 per pound to produce. Product C would sell for $36 per pound and would require an additional cost of $8 per pound to produce. The differential revenue of producing and selling Product C is Oa. $36 per pound Ob. $26 per pound Oc. $22 per pound Od. $17 per pound