The correct answer is D. Paragraph development
Explanation:
In writing, paragraph development involves providing examples, facts, quotes, and other details to explain the main idea of the paragraph or topic sentence. This makes a paragraph to be complete and coherent.
This feature is not included in the paragraph presented because the main idea is stated "An atom is made up of three components", but this is not completely developed since only one of the components is mentioned, and there are not many details explaining the main idea.
The part of the sentence that tells "who" or "what" the sentence is about is the subject.
A. Already have another dog or cat
