New technology like machine guns in World War I helped lead to: O A. the system of trench warfare. O B. a quick victory for Britain and France. C. offensive tactics that favored infantry charges. O D. the complex system of alliances.

a

Explanation:

the andes or andean mountains (spanish: cordillera de los andes) are the longest continental mountain range in the world, forming a continuous highland along the western edge of south america. this range is about 7,000 km (4,300 mi) long, about 200 to 700 km (120 to 430 mi) wide (widest between 18° south and 20° south latitude), and of an average height of about 4,000 m (13,000 ft). the andes extend from north to south through seven south american countries: venezuela, colombia, ecuador, peru, bolivia, chile and argentina.

from wikipedia

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kennedy used a range of this to develop a 'flexible response' plan for any international crisis. “he also expanded the it was important, because it ordered the fall of khruschev.