Which sentence explains what visuals in an informational text do?

They can give the reader an idea of what types of images the author likes.
They can give the reader something nice to look at.
They can help the reader understand the information in the text.
They can replace several paragraphs of information in the text

They can help the reader understand the information in the text.

The sentence that explains what visuals in an informational text do is: They can help the reader understand the information in the text.

The sentence that explains what visuals in an informational text do is: "They can help the reader understand the information in the text."