Which of Frédéric Chopin's compositions were known as "studies," which addressed particular technical challenges on the piano?

The Sch'ma, a central text of Judaism from the Old Testament book of Deuteronomy, provides the climax to this work about the Holocaust

a. "Eroica" Symphony b. Threnody for the Victims of Hiroshima c. A Survivor from Warsaw d. War Requiem

? The emphasis on suffering in Gros's Napoleon Visiting the Plague-Stricken in Jaffa as well as the detailed depiction of the exotic locale presages the turn to which new style?

A. Neoclassicism B. Realism C. Romanticism D. Rococo