Answer: Option (c) is correct.
Explanation:
Correct option(c): Money spent last month repairing a damaged front fender.
This is the best example of sunk cost.
Sunk costs refers to the cost that is incurred in the past and this cost cannot be recovered. This demonstrate that sunk costs should not be included in the decision making of any future projects, and this is due to the cost that cannot vary whether the project has been undertaken or not.
All the other options in the question representing the future costs.