Question 3

For "Beethoven, Ludwig van, 1770-1827. Third symphony ("Eroica"), op. 55," you chose (a.) "Symphonies, no. 3, op. 55, E-flat major."

That is correct! The correct uniform title begins with the name of the form ("Symphonies"). In this case the performance medium ("orchestra") is not necessary, as it is implied by the name of the form. "Eroica" is a popular nickname for this symphony.

Go on to Question 4.