Tigris and Euphrates is the answer
The bombing of Pearl Harbor was the final reason that gave the US justification in joining the war in Europe.
The entrance of West Germany into NATO was the final step in integrating that nation into the defense system of Western Europe. It was also the final nail in the coffin as far as any possibility of a reunited Germany in the near future. For the next 35 years, East and West Germany came to symbolize the animosities of the Cold War. In 1990, Germany was finally reunified; the new German state remained a member of NATO.
The correct answer is: d. Motet.
The motet is a polyphonic composition born in the 13th century, made for singing at mass as a Latin religious choral composition, with biblical texts commonly. Until the 17th century it remained as one of the most important musical forms of polyphonic music. It was also characterized for its various melodies.
In the 15th century and the 16th century it expanded as a polyphonic vocal piece without instrument backing, a capella, with dynamically contrasting vocal lines with a imitative and dramatic character. It was one of the prominent polyphonic forms of Renaissance music.
The development of railroads was one of the most important phenomena of the Industrial Revolution. Trains provided supplies and equipment and a lifeline of the army. Trains made a big impact on the citizens. Railroads were visible symbols of industry and modernity during the Civil War.