What is the term for a free-form instrumental work that "seeks out" a mode, theme, or contrapuntal realization of a subject?

In 1800, the transatlantic slave trade was reaching its peak, with nearly __________ enslaved Africans transported to the Americas each year

A. 250,000 B. 100,000 C. 75,000 D. 300,000 E. 500,000

What non-musical sound does this piece of music imitate?

a. Barnyard animals b. Automobiles c. Airplanes d. Trains