The correct answer is B. Demand factor is defined as the ratio of the maximum demand of a system or an equipment to the connected load. In other words, it is the ratio of the actual load to the potential load. A low demand factor indicates that the system is not being used efficiently, while a high demand factor indicates that the system is being overloaded.
Option A is the definition of load factor. Load factor is the ratio of the average load to the maximum demand. It is a measure of how efficiently a system is being used. A high load factor indicates that the system is being used efficiently, while a low load factor indicates that the system is not being used efficiently.
Option C is the definition of connected load. Connected load is the total load that is connected to a system. It is the sum of the individual loads of all the equipment that is connected to the system.
Option D is not a valid definition of demand factor.