The following two lines of formatted text appear in different parts of a magazine article about how video games have changed over the years:

The History of Video Games

The 1950s

What is the relationship between the two lines of text?

A.
Both lines are section headings.
B.
Both lines are descriptive photo captions.
C.
The first line is the main heading of the article, and the second line is a section heading.
D.
The second line is the main heading of the article, and the first line is a section heading.