As a careful reader, you should analyze what you have read to consider

1.the author's purpose

2.what the author has communicated to you

3.how you should respond

4.how much the book cost

1. and 2. are both good answers, but im leaning more towards 1.

What the author has communicated to you. The reason is that you should always reflect on what the author is trying to say so that you can figure out the main idea or plot. hope this helps

Conclusion if that's an answer.