Carmen Co $.$ ?can further process Product J to produce Product D $.$ ?Product J is currently selling for $ $20\mathrm{.}00$ ?per pound and costs $ $15\mathrm{.}75$ ?per pound to produce. Product D would sell for $ $38\mathrm{.}00$ ?per pound and would require an additional cost of $ $8\mathrm{.}55$ ?per pound to produce.

The differential cost of producing Product D is

a $.$ ?$ $6\mathrm{.}50$ ?per pound

b $.$ ?$ $17\mathrm{.}00$ ?per pound

c $.$ ?$ $8\mathrm{.}55$ ?per pound

d $.$ ?$ $5\mathrm{.}25$ ?per pound