How did media lead to the credibility gap

seeing as no choices were provided, i'll do my best to answer it from knowledge.

job specialization promotes work ethic to the person doing the job. he/she may be strong in the arms and able to lift things, specializing him/her in a job where you lift and carry.

in the 1950s, country music came into its own before rock-n-roll took off in the 60s while jazz and classical music continued to innovate