Final answer:
Option A provides the clearest and most direct revision for the underlined sentence, making it more accessible to readers.
Step-by-step explanation:
Option A is the best revision to make the underlined part of the sentence labeled (3) less technical and more understandable. The Cherokee Indians were a single tribe, or "Indian Nation," that inhabited the southeast region of what is now the United States some 200 years ago. In the years covered by the Indian Removal Act, the 1830s and 1840s, a large number of Cherokee people were relocated westward to what is now the State of Oklahoma. Write to: with inquiries concerning these guidelines or for details from the documents. Without using the more complex phraseology seen in the other options, this option clearly urges the reader to write for additional information while simplifying the language.