Answer :
The increasing popularity of rock and roll music was only indication that American culture was becoming more youth-oriented in the 1950s. Thus, option (c) is correct.
What is culture?
The term “culture” describes society's entire life, such as dress code, language, religion, rituals, and artistic standards as a result. The culture depends on area, location, country, and the group of people's behavior.
Rock and roll parties were the start of the 1950s. Rock and roll parties, movies, and concerts are popular among young people in America. The young person primarily attends rock & roll gatherings. Rock and roll music's sound relied heavily on rhythm and blues.
Therefore, option (c) the increasing popularity of rock and roll music is correct.
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