What Did John Holland's Research Prove with Regard to Career

What did John Holland's research prove with regard to career choice?

A) That career paths are seldom direct but rather haphazard as young people take on jobs and roles in life
B) That each of us tends to choose and be successful at careers that match our personality
C) That like love, there is one true career for each person that will make them ultimately happy
D) That the careers that you play acted as a child are most often the jobs you seek later as an adult