Answer: The correct answer is: Out-group homogeneity effect.
Explanation: The out-group homogeneity effect can be understood as the tendency that people have to perceive out-group members as being more similar between them than in-group members.
An statement of a person experiencing Out-group homogeneity effect may sound like this:
"We students of psychology are so different and unique, we are very complex individuals with such interesting ideas and thoughts, every psychology student i've met is so different, each with unique ways of conceiving the world. However engineers are all the same, they all like numbers, and think they are the center of the universe, they even look the same to me".
In this particular case, the student states that "Accountants are all boring number crunchers without an ounce of creativity, thus he is experiencing the out-group homogeneity effect.