Louis Armstrong and Joe "King" Oliver both played the cornet

Which of the following is not a purpose for which artists utilize line?

a. To control vision b. To create unity c. To create meaning d. To simulate weight

François Rude's sculpture La Marseillaise represents

a. a parade in Paris. b. Liberty leading France to protect the motherland. c. the French Revolution led by Louis XVI. d. the battle of the Centaurs.