Answer:
The placement of the return address, date, and complimentary closing
Step-by-step explanation:
A business letter can be defined as a formal written form of communication used by business organizations to professionally communicate with other businesses, companies and clients.
There are two (2) main styles used when writing a business letter;
1. Block style business letter: all the texts contained in the letter are aligned to the left (left-aligned) and must be single spaced without any exception.
2. Modified block style business letter: it uses a format that differs from the block style in that the date, return address sign off or complementary close and signature lines are centered (center-aligned) to the page or body of the letter.
Hence, the major difference between a block style business letter and a modified block style letter is the placement of the return address, date, and complimentary closing.