Final answer:
Template stability is the biometric factor that indicates the resistance of a biometric characteristic to change over time, ensuring the trait used for identification remains consistent.
Step-by-step explanation:
The biometric factor that describes how well a characteristic resists change over time is B) Template stability. Template stability refers to the persistence of a biometric sample's measure over time. It is crucial in biometric systems to ensure that the physical or behavioral trait used for identification or verification is consistent and does not vary significantly as the user ages or due to environmental changes. Examples of biometric traits often used for this purpose include fingerprints, facial recognition, and iris patterns, which tend to remain stable over the lifespan of an individual.