Can you please provide the passage?
Answer:
Reading between the lines is also known as inferring. It is when the information isn't explicit but you have to do some digging for it and it is not out of reach, therefore a reading between the lines question is a question where it doesn't give you all of the info, but you have to work out some of it for yourself.
B. it conveys the subject of the paragraph.
A topic sentence is the main idea which is the subject of the paragraph.