Which of the following leadership theories argues that because of time pressures, leaders establish a special relationship with a small group of their subordinates  the in-group, who are trusted, get a disproportionate amount of the leader's attention, and are more likely to receive special privileges?
选项：

A:Situational leadership theory
B:Leader-member exchange
C:Fiedler's theory
D:Expectancy
E:Path-goal