How should the body of the letter be aligned in a standard format?

In a standard letter format, the body of the letter should be left-justified. This means that all lines of text start at the left margin, creating a clean and organized appearance that is easy to read. Left-justifying the text provides a consistent and professional look, which is important in formal communication.

Moreover, this alignment follows the traditional formatting style used in business correspondence, allowing for a straightforward presentation of information. Left-justified text also helps in maintaining a uniform line length, which aids in readability and ensures that the content is presented in a clear and concise manner.

The other options either do not conform to standard practices or would create a less readable or professional appearance, making left justification the preferred choice for effective communication.