Why do composers typically add a coda to a theme and variations movement?

What event provides the focal point of Leo Tolstoy's War and Peace?

a. Alexander II's emancipation of Russian serfs b. the Russian Civil War c. the Crimean War d. Napoleon's invasion of Russia

In 63 B.C.E., which of the following was the Roman-administered homeland of the Hebrews in the eastern Mediterranean region?

A. Israel B. Judea C. Palestine D. Gaza