Correct capitalization for: with the invention of the cotton gin during the industrial revolution, the south experienced major social and economic changes

In a speech to high school students, a business owner makes the following statement short response

I’n a rough draft, where should the main idea first appear in the paper

Which of these best identifies the text elements used in this text? a) heading and italics print b) pictures and capitalization c) headings and bold faced print d) capitalization and underlining