Setting realistic goals for behavior change means having

A) several alternative goals.
B) simple goals.
C) open-ended long-term goals.
D) challenging but not impossible goals.

Setting challenging but not impossible goals is the best option for behavior change because it creates motivation and a sense of accomplishment when the goal is achieved. However, it should also be realistic to avoid discouragement and failure. Having several alternative goals or open-ended long-term goals may not provide enough focus or direction, while simple goals may not be enough of a challenge to create lasting change.