Question 6 (4 points) Max Company uses 20,000 units of Part A in producing its products. A supplier offers to make Part A for $7. Max Company has relevant costs of $8 a unit to manufacture Part A. If there is excess capacity, the opportunity cost of buying Part A from the supplier is a) $20,000. Ob) $0. Oc) $160,000. O d) $140,000