Choose the most appropriate topic sentence for the following paragraph.

First I go to English class, where we are mostly learning about Shakespeare and his life. After that, I head over to the science lab; we're studying about pollution and greenhouse gases. Then I have a short break where I can talk to my friends. When the break is finished, I go to math. We're learning about factorials right now, which is pretty fun. After math is lunch, and then I have an afternoon filled with choir, history, and basketball practice.

1.) I always have a set schedule for my day.
2.)High school students do many things during the day.
3.) My day is filled with studying. Lunch is a short break during my day.
4.) The best thing about my day is the stuff that I learn.

In writing, a topic sentence refers to a concise sentence that tells the reader the content of a paragraph, because of this, this sentence is usually the first sentence in a paragraph and encloses all the ideas on it. This means an appropriate topic sentence should summarize or cover all the ideas included in a paragraph in a concise way. In the case of the paragraph presented the narrator describes all the classes and activities she or he does during a day, including the English Class, the science lab, the break, the Math class, the lunch, and the basketball practice, this means the paragraph is about the different activities during the day and therefore the best topic sentence for this paragraph is "I always have a set schedule for my day", because this idea summarizes the all the content of the paragraph, considering all the sentences are about the different activities that the narrator should do during the day or the timetable or schedule he or she follows.