Yasmin Co$.$ can further process Product B to produce Product C$.$ Product B is currently selling for $$34$ per pound and costs $$26$ per pound to produce. Product C would sell for $$58$ per pound and would require an additional cost of $$23$ per pound to produce. The differential cost of producing Product C is

a$.$ $$23$ per pound

b$.$ $$26$ per pound

c$.$ $$58$ per pound

d$.$ $$34$ per pound