I am sure it is D.); The other options do not make sense. The most logical answer is D.)
A heading is similar to a caption, a line below a photograph that briefly explains it. Headings show up at the top of paragraphs, chapters, or pages, and they give you an idea of what the subject is. You might write a heading for each chapter of your novel, or on each page of your Spanish club newsletter.
I believe the answer is improve, i hope this helps
