Identify the topic sentence in the following paragraph.（）

Identify the topic sentence in the following paragraph.（）
Time Management
（1） No matter how you slice it， there are only 24 hours in a day.（2） To be successful at university， students need to learn good time-management skills.（3） The first skill is not taking on more than you can handle.If you are a working part-time， have a family and are involved in a community organization， then taking a full course-load at university will be too much.Another time management skill is reasonably estimating the time required to perform each of the tasks at hand.For example， profoundly reading a chapter from a course text cannot be completed in between television programmes.Finally， actually doing what needs to be done seems obvious， but is a very difficult skill.You may find that cleaning out your wardrobe becomes vital when you are avoiding study.Procrastination is a time manager's enemy.（4） By learning time management skills your university study will be successful and most importantly enjoyable.
A.Sentence（1）
B.Sentence（2）
C.Sentence（3）
D.Sentence（4）
正确答案：Sentence（2）