The correct answer is D) Property must have been sacrificed or an expenditure of money incurred. This is correct because for a situation to be considered general average, the ship's master must have made a voluntary sacrifice of part of the ship, its equipment, or its cargo, or have incurred an extraordinary expense, in order to save the remainder of the property involved from a common peril. The loss or damage must have been intentional and for the common benefit of all parties involved, not just accidental damage. The other options are incorrect because A) general average involves all three parties (ship, freight, and cargo), B) the damage does not have to occur during the ship's intended use, and C) damage to deck cargo due to heavy weather alone does not qualify as general average.