When comparing texts by the writer the similarities and differences conclude about the writing ability of the author. Thus option D is correct.
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Writing ability is the writer's capability and capacity to produce the content and the text from the phrases and the words that have a meaningful purpose and definition.
It allows the readers to understand the purpose of the topic matter that the author wants readers to understand. The writing ability of the author is evaluated on basis of the similarities and the differences.
It shows the writer's knowledge, and capability to use the topic to write the matter with differences and similarities. It allows the readers to understand that the writer can use correct grammar, characters, topic matter, and expression of the ideas.
Therefore, the similarities or differences tell about the writing ability.
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