How might a reader find captions useful?

Readers can use them to identify main ideas at a glance.
Readers can use them to make connections to knowledge.
Readers can use them to obtain summary information quickly.
Readers can use them to understand a visual element's content.

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D.  Readers can use them to understand a visual element's content.

Sometimes when you are researching or reading (be it a book, magazine, online article, etc.), you will encounter pictures, drawings, charts, and graphs.  Beneath these images, there will sometimes be a caption that includes information which will elaborate or describe the content in order for you to gain a better understanding of what it is you are seeing or for the author detailing some specific information he or she feels you should know in order for you to better understand a topic/point being presented or argued.

D. Readers can use them to understand a visual element's content.

Why can’t I read the captions?

When the caption text is not accessible to the screen reader, the blind watcher can not, navigate to the caption, read it, spell the unclear words, copy the text to make the note, etc. Also note that when captions, are not read automatically by the screen reader, reading captions manually is the only way of accessing them.

What is the purpose of captions?

Captions tell the reader what happened before & immediately after the captured action of the photograph. Captions, identify all people in the photograph on whom the actions are centered. Guidelines, for caption writing

Learn more about caption writing here https://brainly.com/question/15267606

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