Which of the following statements is true?

A) Entitativity and cohesion are basically the same thing.
B) As individual's social identity increases,the overall cohesiveness of the group decreases.
C) Evidence indicates that individuals who sacrifice their lives for their group may be experiencing identity fusion (the individual identity is fused with the collective) .
D) All the listed statements are true.

There is evidence to suggest that individuals who sacrifice their lives for their group are experiencing identity fusion, where their individual identity is fused with the collective. Entitativity refers to the perception of a group as a unified entity, while cohesion is the degree to which group members work together in order to achieve common goals. These two constructs are related, but not the same. Option B is a false statement, as higher social identity tends to lead to increased cohesiveness in a group. Option D is incorrect as statement A is false.