The statement that best describes how the image reinforces the text is the one that reads as follows: "The image aids readers' understanding of key concepts".
Images are far more explanatory and descriptive. They show what the text tries to say in more graphic way, so the reader gets a clear idea. It is said that a picture is worth a thousand words. By putting together both the images and the text, the readers get the whole picture.
Rational and logical are quite similar in meaning but rational is something that has logic. These two words are close synonyms and not antonyms.
