What is bridge of paragraph

The bridge of the paragraph is the transition between the previous and the next paragraph.

Explanation:

When you're writing a text, it's important for its pieces to be connected to each other well. That's how the text flows smoothly and doesn't feel like its pieces were simply glued together. That's the purpose of bridges. A bridge sentence is a sentence at the end of the paragraph that summarizes what has already been said in it and signals what the following paragraph will be about.

i it is b. but if its not sorry