Rubium Micro Devices currently manufactures a subassembly for its main product. The costs per unit are as​ follows: Direct materials ​$54.00 Direct labor 35.00 Variable overhead 40.00 Fixed overhead 34.00 Total costs ​$163.00 Crayola Technologies Inc. has contacted Rubium with an offer to sell​ 6,000 of the subassemblies for​ $144.00 each. Rubium will eliminate​ $89,000 of fixed overhead if it accepts the proposal. Should Rubium make or buy the​ subassemblies? What is the difference between the two​ alternatives?
A. ​Buy; savings​ = $7,000
B. ​Make; savings​ = $203,000
C. ​Buy; savings​ = $89,000
D. ​Make; savings​ = $1,000