When creating a goal, it is important to be specific in what you want to obtain. The only way to successfully reach a goal is to know what you're reaching for. For example instead of setting the broad goal of "losing weight this summer" be specific, and say "I want to lose 20 pounds by the end of the summer" or better yet, "I want to lose 1-2 pounds eah week this summer through healthy diet and exercise." The more precise you are, the more likely you are to be direct and capable to accomplish your goal. This gives you a specific accomplishment to strive for rather than a broad and unclear statement .
So the correct answer is D.