Ethan paid $3 for a bottle of ThirstAid. Later while on a hiking trip, she was offered $8 for the ThirstAid. Select the correct statement from the following:
A. The $8 offer is not relevant if Ethan refuses to sell the ThirstAid.
B. If Ethan drinks the ThirstAid, no opportunity cost is associated with his decision.
C. The $3 original purchase price is irrelevant to his decision to sell the ThirstAid.
D. All of the above.