Answer: A. at the time of contracting.
Step-by-step explanation:
Insurable interest is the reasonable concern to obtain insurance against unforeseen events such like losses or death. Insurable interest is when the loss of an object or damage would result in a financial loss.
Based on the information given, Maddox Auto Parts gained an insurable interest in the mufflers at the time of contracting. An individual will gain an insurable interest immediately s contract takes place.
Therefore, the correct option is A.