Final answer:
Intrinsic motivation and personal values are likely to be the strongest motivating force of behavior change for most people.
Step-by-step explanation:
The strongest motivating force of behavior change for most people is intrinsic motivation and personal values. Intrinsic motivation refers to the internal drive and satisfaction that comes from performing a task for its own sake, without any external rewards or incentives. Personal values, on the other hand, are the beliefs and principles that guide an individual's behaviors, and when those values align with a desired behavior change, it can be a powerful motivator. Fear of punishment, social pressure, and financial incentives can also influence behavior change, but they are generally not as strong as intrinsic motivation and personal values.