Concept:Agency by necessity arises in an emergency to protect the owner’s property.Explanation:When an agent holds another person’s goods, an emergency may make it impossible to get the owner’s instruction first.If goods are perishable, the agent may sell them to prevent loss or waste.This form of agency is not based on prior consent or conduct but on the urgent need to act.Therefore, the agent becomes an agent by necessity because the situation compels the action.Answer:C. necessity