Final answer:
The option that is not one of the factors for determining freight classification is d)'handling characteristic'. The proper factors include density, liability, and stowability.
Step-by-step explanation:
The four freight classification factors which are used to determine the ratings of commodities include density, liability, stowability, and handling characteristics.
However, the option that is not one of these factors for determining freight classification is d) handling characteristic.
The other three factors, density, liability, and stowability, are indeed used in defining freight classes.
The factors such as departure time of a commuter train at rush hour, distance from your house to school, or the temperature of a refrigerator at any given time do not directly play into freight classification.
Additionally, weight of a bag of rice at the store may relate to density but is a specific example rather than a broad classification factor.