Answer:
The correct answer is B.
Explanation:
Giving the following information:
Direct materials: $5
Direct labor: $2
Avoidable Overhead: $1
Total cost: $8.
The company can purchase the component from another source for $10.
The unitary cost of making the product is $8. $3 of the overhead is unavoidable, therefore it is irrelevant to the decision making process.
The difference between making and buying is $2, being cheaper for making in-house.