To compare and contrast jazz and rock 'n' roll based on the information provided in the two articles, we can evaluate the options offered:
A. They appealed to different age groups.
While jazz was significant during the early 20th century (the "Jazz Age" in the 1920s), rock 'n' roll particularly appealed to the youth during the 1950s. Thus, there is a potential difference in age group appeal, especially considering the cultural contexts of their respective eras.
B. They were influenced by widely different sounds.
Jazz was influenced by a blend of African rhythms, Caribbean, Church, Creole, and Cajun songs, while rock 'n' roll derived from African-American rhythm and blues, as well as white country music. While both genres have diverse influences, they do share foundational aspects, particularly in their roots in African-American music. So this option is not valid as a clear distinction.
C. They developed during different eras.
Jazz became prominent in the early 20th century (especially in the 1920s), while rock 'n' roll emerged notably in the 1950s. Hence, they indeed developed during different periods.
D. They identified with different values.
Jazz in the "Jazz Age" is associated with liquor, youth, excess, and a liberated lifestyle. Rock 'n' roll, while also associated with youth, is characterized more by rebellion and a free-spirited lifestyle but does share some overlapping values with jazz.
Based on this analysis, the best answer is: C. They developed during different eras.