11. The main difference between block letter style and modified block letter style is/are the?

a. left and right margin settings,
b. punctuation style,
c. position of the date and closing lines,
d. line spacing

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The main difference between block letter style and modified block letter style can be found in the position of the date and closing lines.

To understand the differences in these two letter styles, you can follow these steps:

1. Block Letter Style: In block letter style, the entire letter, including the date, closing lines, and signatures, is left-aligned. This means that all the lines in the letter start at the same margin, generally at the left side of the page. This style does not indent any lines.

2. Modified Block Letter Style: In modified block letter style, the date and closing lines are centered or slightly indented to the right, while the rest of the letter's lines are left-aligned. This means that all the lines, except for the date and closing lines, start at the left margin.

Now, let's examine the given options and their relevance to the main difference between these styles:

a. Left and right margin settings: This option is not directly related to the main difference between these two styles. While the margin settings can be different in block letter and modified block letter styles, it is not the primary difference between them.

b. Punctuation style: The punctuation style, such as the use of commas and periods, is not specific to either block letter or modified block letter styles. It can be the same in both styles, depending on the writer's preference.

c. Position of the date and closing lines: This option correctly explains the main difference between the two letter styles. In block letter style, the date and closing lines start at the same margin as the rest of the letter. In modified block letter style, they are centered or slightly indented to the right.

d. Line spacing: Line spacing, such as single or double spacing, is not necessarily different between block letter and modified block letter styles. The line spacing can be adjusted as per the writer's requirements in both styles.

In conclusion, the main difference between block letter style and modified block letter style is the position of the date and closing lines.