Final answer:
In MLA format, paragraphs should be indented one-half inch from the left margin, double-spaced, with one-inch margins on all sides. Headings need special formatting, and direct quotations have specific embedding rules.
Step-by-step explanation:
Based on MLA guidelines, the correct alignment for paragraphs is to indent paragraphs by one-half inch from the left margin. This format is part of the general features of MLA style which is widely used for documenting research sources in English and other humanities disciplines. When using a word processor like Microsoft Word, this indentation can typically be achieved by setting the first-line indent to 0.5 inches on the ruler, or by using the 'Paragraph' settings to set the indentation under the 'Special' drop-down menu to 'First line'.