Question

born in 1902 at the dawn of the century, lear demonstrated an early interest in electronics and electric equipment. by the age of 12, he had already built his own radio set with scraphems, a significant achievement considering the time period. this early fascination with electronics set the stage for his future endeavors.
despite completing only the eighth grade, it was common at the time for individuals to leave school early and seek employment. lears decision to do so was not a dropout but rather a reflection of the prevailing educational norms of the early 1900s. his experiences during world war i played a pivotal role in shaping his career. at just 16 years old, lear joined the u.s. navy, lying about his age to enlist. during the war, he worked as a \grease monkey,\ maintaining military aircraft in chicago. this experience not only exposed him to mechanics but also allowed him to learn about aviation and radio technology.
after world war i, lear continued his career as an aviation mechanic at chicagos airport and began working as a radio salesman. his passion for radio technology remained steadfast, and by the age of 20, he had founded his first company, the quincy radio company. lears company started designing radios, including the first practical automobile radio for cars, known as the \learcope.\ this innovation revolutionized the way people experienced driving, as radios in cars became commonplace.
how did bill lear contribute during world war i?
he worked as a \grease monkey,\ maintaining military aircraft.
he served as a pilot for commercial airlines.
he worked in a hospital as an aide.

Explanation:

The text on the left side of the image mentions that during World War I, Bill Lear joined the U.S. Navy and worked as a "grease monkey" maintaining military aircraft in Chicago. This directly corresponds to the first option on the right side. The second option about serving as a commercial airline pilot is not mentioned in relation to World War I (it's more of a post - war or later - career thing if at all, and the text doesn't support it for WWI). The third option about working in a hospital as an aide has no basis in the provided text.

Answer:

He worked as a "grease monkey" maintaining military aircraft.