Which of the following factors facilitates group cohesion and communication among members?​

A) ​Diverse cultural backgrounds of members
B) ​Significant homogeneity in personal characteristics
C) ​Low levels of self-disclosure
D) ​Large size of a group

Significant homogeneity in personal characteristics facilitates group cohesion and communication among members. When group members share similar values, beliefs, and backgrounds, it is easier for them to understand each other and work towards achieving common goals. Additionally, the absence of significant differences in personal characteristics reduces the likelihood of conflicts and misunderstandings. Diverse cultural backgrounds of members (option A) may lead to misunderstandings if not handled properly, and low levels of self-disclosure (option C) hinder effective communication among group members. A large size of a group (option D) may also hinder effective communication and lead to difficulties in achieving cohesion.