what is the purpose of a topic sentence in a paragraph

to express the central idea of a paragraph
to provide evidence for the ideas in the paragraph
to explain where readers can find more imformation about the topic of a paragraph
to describe the most important details that will be incluedes in the paragraph
chose only one pls

The purpose of a topic sentence in a paragraph is to express the central idea of the paragraph.

Sure! The purpose of a topic sentence in a paragraph is to express the central idea of that paragraph. It acts as a guide for the rest of the sentences in the paragraph and helps the reader understand the main point or focus of the paragraph. By reading the topic sentence, the reader can get a clear idea of what the paragraph is going to be about. So, the correct choice would be "to express the central idea of a paragraph."

The purpose of a topic sentence in a paragraph is to express the central idea of the paragraph.