Use the list below to answer question 26.
•the development of machine guns and use of barbed wire
•the use of improved submarines or U-boats to sink enemy shipping
•the invention of the tank to cross trenches
•the first use of airplanes as weapons
26. The development and use of these weapons are most closely associated with which of the following?
A. the French Revolution.
B. World War I.
C. the Russian Revolution.
D. World War II.