The correct answer to this open question is the following.
Although you forgot to attach the options for this question we can say the following.
The reason for the reader to revise this introduction is to add a topic.
You have to take into consideration the main idea that was written at the beginning of the sentence to add a topic in accordance with that idea that has coherence and congruence with what was already written.
That is why it is good to always have other people revise or edit your text because it has a fresher approach to the text and can recommend useful changes or additions that could improve the quality of your text.