The serif font is unique because it a. has small lines or characters added to the ends of the characters for embellishment. b. persuades the general public to consume or purchase a product or service. c. uses symbols which are easily recognizable by all people across the world. d. changes the appearance of the layout, while providing the same message.

ANSWER:

a. has small lines or characters added to the ends of the characters for embellishment.

EXPLANATION:

In typography, a serif is a little line joined to the finish of a stroke in a letter or image. A typeface with serifs is known as a serif typeface. A typeface without serifs is called sans-serif or sans-serif, from the French sans, signifying "without".

The serif font is unique because it has small lines or characters added to the ends of the characters for embellishment. 
Hope this helps. :)

C. she wanted to answer sexist rumors about her paintings.

The "maple leaf rag" (copyright registered on september 18, 1899)[1] is an early ragtime musical composition for piano composed by scott joplin. it was one of joplin's early works, and became the model for ragtime compositions by subsequent composers. it is one of the most famous of all ragtime pieces.[2] as a result joplin was called the "king of ragtime". the piece gave joplin a steady if unspectacular income for the rest of his life.