Speciemen

Adrian is the manager of a call centre. Consultants have advised him that by reorganising his teams to complete highly specific tasks the call centre will be able to increase the throughput of work significantly, as well as increasing the number of sales calls made to the public. The reorganisation proposals are unpopular with many workers, who feel that their jobs will become tedious and repetitive.
The proposal to reorganise the work of the call centre utilises principles put forward by which school of management thought?
A The administrative school
B The empirical school
C The scientific school

Answer is C. Luckily, I made that. But no idea about A and B. I tried to find in Kaplan text book and OT notes but couldn’t find these. Please explain me.