Final answer:
Jill's goal to 'lose weight' is problematic because it lacks specificity and a measurable target. It is important to set realistic goals with clear targets and timelines for better tracking and motivation.
Step-by-step explanation:
When it comes to Jill's goal of 'losing weight,' the problem lies in its lack of specificity and a measurable target. A specific and measurable goal would involve setting a target weight to reach within a certain time frame. By doing so, Jill can track her progress and stay motivated.
Setting a goal that is too ambitious and unrealistic, option B, can also be problematic. It can lead to disappointment and frustration if the goal is not achieved. It's important to set realistic goals that can be achieved with effort and commitment.
Therefore, the correct answer is A) It lacks specificity and a measurable target.