(C) Unrealistic goal
Reading an entire year's syllabus in one day to get good marks is an example of an unrealistic goal, as it is not practically achievable.
The statement describes something impossible to accomplish practically, making it unrealistic. Examiners expect you to identify that a goal must be practical and achievable; cramming a full year's syllabus in one day clearly is not. Note: The source passages provided are unrelated to this question, but the answer is based on general academic knowledge of goal-setting concepts tested in this topic.