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Etched into Peru's Nazca Desert are line drawings so large that they can only be fully seen from high above. Archaeologists have known of the lines since the 1920s, when a researcher spotted some from a nearby football, and they have been studying the markings ever since. __________ archaeologists' efforts are aided by drones that capture high-resolution aerial photographs of the lines.<br/><br/>Which choice completes the text with the most logical transition?