Option D, Both A & C
Step-by-step explanation:
A company invested $400,000 in a technology that reduced the overall costs of production by reducing their cost per unit from $2 to $1.85 . Later, a manager has an opportunity to outsource production to another company at a cost per unit of $1.75 . If you are the manager, you should consider the $400,000 as a sunk cost, not relevant to the decision and should ignore the $400,000 fixed cost.
Sunk cost is the cost which is already incurred in past and does not have any significance in decision making.
A sunk cost is already incurred in the fields of economy and business decision-making and can not be recovered. Sunk costs are contrasted with future costs, which can be avoided if measures are taken.