Respuesta :
The 1842 expedition of John C. Fremont contributed to westward migration because he publicized the beauty of the West.
Who was John C. Fremont?
John Charles Fremont (1813-1890) was an American explorer, politician, and soldier. Through his explorations in the West, he stimulated the American desire to own that region. He was the first presidential candidate of the Republican Party.
John Charles Fremont became a popular national figure after leading a series of expeditions intended to survey the Far West in the 1840s. The newly formed Republican Party chose Fremont, an outspoken critic of slavery, as their first presidential candidate in 1856.
Thus option D holds true, that he publicized the beauty of the West.
Learn more about John C. Fremont here,
https://brainly.com/question/3190029
#SPJ2