When Green Corp

When Green Corp.recently acquired Orange Corp.,employees in each company began to privately complain about the behaviour and performance of employees at the other organization.For example,Orange employees would claim that Green employees lacked customer service skills,whereas Green employees claimed that they were more responsive to customer needs.Employees would also label each other by their former colour ('She's a Greenie') .This incident mainly describes which of the following concepts?

A) Social identity theory
B) Self-enhancement
C) Corporate identification theory
D) Disagreeableness trait
E) None of the above