Chapter 1, Problem 3Q

I am looking for the correct answer to this general accounting problem using valid accounting standards.

In 2020, it cost Jason Manufacturing $14 per unit to produce component R8. In 2021, it has increased to $18 per unit. In 2021, Eastern Supplies has offered to provide component R8 for $11 per unit to Jason. As it pertains to the make-or-buy decision, which statement is true? a. Net relevant costs are $3 per unit b. Incremental revenues are $4 per unit c. Differential costs are $7 per unit d. Incremental costs are $4 per unit

Please provide the answer to this general accounting question using the right approach.