Final answer:
The motivational ruler is the technique used to determine how motivated a person is to change, by having them rate their motivation on a scale.
Step-by-step explanation:
The tool that can be used to elicit the extent to which a person feels compelled to change is the motivational ruler. This technique involves asking the person to rate their motivation to change on a scale, often from 1 to 10. It helps to gauge the strength of an individual's motivation and readiness to change a particular behavior. Expressing empathy is about understanding the person's feelings and perspectives without judging them. The righting reflex is the professional's desire to fix what seems wrong with the client which may not be effective for the change process. Rolling with resistance means not confronting resistance directly but rather moving with it, acknowledging the person's feelings and perspectives.