We can actually deduce here that the text feature, if added, would best aid the reader's understanding of the document is: Explanation of different symbols.
<h3>What is symbol?</h3>
Symbol is actually known to be something which is used to represent something else. It can be an object representing something abstract. It is also known as an emblem.
We see here that if there is explanation of different symbols, the reader will understand the document better.
Learn more about symbol on brainly.com/question/1389310
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Long sentences
If an author uses long, extended sentences, it will create more of a long, slow, page for the reader. Short sentences increase the pace and make it feel faster, while long sentences can lull the reader into a slower rhythm.
I think that’s correct :)
C, it makes better sense.