4. which statement about paragraphs is accurate? a. they are always the same length. b. they always contain a topic sentence. c. they are always focused on a main idea. d. they are always indented.

The way I see it, a paragraph is not always focused on the main idea nor is the same length as others. A paragraph contains a topic sentence and tends to be intented, so the most accurate is "B"

Explanation:

it would be d because the however is more proper and the comma is placed in the right spot

c.    

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