According to sociologist Randall Collins,it takes more and more certificates and diplomas to qualify for a given job.He calls this:

A) educational achievement
B) mass schooling
C) educational attainment
D) professionalization
E) credential inflation

Credential Inflation

The devaluation of educational or professional qualifications due to the increasing number of people attaining these credentials, making it more difficult to secure jobs without higher levels of education.

Certificates

Official documents attesting to the truth of certain facts or the completion of specific requirements, often relating to education, qualification, or ownership.