In Option (1), the phrase "on the paper" refers to the medium or surface on which suggestions are written, but it doesn't align with the context of practicality.
In Option (2), "to make a truckload of paper" is a clear, factual expression related to the production of paper.
In Option (3), the phrase "paper over" is used metaphorically to mean covering up or smoothing over a conflict. This is the correct context for the word "paper."
In Option (4), "a paper on criminalization of politics" is correct as it refers to a formal written document or scholarly work.
\[
\boxed{3}
\]