What is the correct structure of a well-formed paragraph?

The correct structure of a well-formed paragraph is centered around the concept of clarity and cohesiveness in conveying an idea. A well-constructed paragraph typically begins with a topic sentence that introduces the main idea or theme of the paragraph. Following the topic sentence, supporting sentences provide evidence, details, or examples that reinforce the central idea. This organization helps the reader understand the purpose and argument of the paragraph effectively.

Including signal words or phrases can further enhance the clarity of the paragraph by guiding the reader through the logic or flow of thoughts, but they are not essential components of the basic structure. Therefore, the focus on having a clear topic sentence followed by supporting sentences makes this choice the most accurate representation of effective paragraph construction.