Grace Co. can further process Product B to produce Product C. Product B is currently selling for $19 per pound and costs $15 per pound to produce. Product C would sell for $38 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?

a.$38 per pound

b.$29 per pound

c.$19 per pound

d.$23 per pound