What is the main point or statement that you can compare across different texts to see if a connection can be made?
theme
thesis
tone
topic

thesis

Explanation:

A "thesis" refers to the main point or main idea of a person's writing. It tells his position and present his information in relation to his topic. Since this is what the paper is actually all about, then this is the one which can be compared across different texts to see if a connection can be made. Thus, it is important that the thesis is clear and specific.

So, this explains the answer.