The correct answer is Option D.
We have to identify the point that does NOT hold true for a paragraph.
Option A is the incorrect option because a paragraph concentrates on one idea only.
A convincing conclusion is a characteristic of a well-written paragraph, therefore Option B is incorrect.
While a paragraph concentrates on one main idea, it is supported by subordinate ideas. However, these subordinate ideas should ultimately support and point towards the main idea. This makes option C the incorrect option.
Hence option D- none of the above is the correct answer.