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Jack Kerouac, author of On the Road, was the
a. pediatrician who urged mothers to stay at home with their young children
b. spiritual leader of the beatniks
c. evangelist who led religious crusades all across the country
d. sociologist who first described the "silent generation"

B

Right.

To determine which option is correct, we need to understand the role and accomplishments of Jack Kerouac. Jack Kerouac was an American author and poet, best known for his novel "On the Road." His writings were a significant influence on the Beat Generation and the counterculture movement of the 1950s and 1960s.

Based on this information, we can now evaluate the given options:

a. Pediatrician who urged mothers to stay at home with their young children: This option does not align with Jack Kerouac's profession or literary contributions.

b. Spiritual leader of the beatniks: The Beat Generation is closely associated with Kerouac's work, making this option a likely correct answer.

c. Evangelist who led religious crusades all across the country: There is no evidence to suggest that Kerouac was involved in religious crusades or acted as an evangelist.

d. Sociologist who first described the "silent generation": Although Kerouac's work had sociopolitical undertones, he didn't specifically describe the "silent generation" or push forward the term in the same way a sociologist might.

Therefore, the correct answer is b. spiritual leader of the beatniks.