Final answer:
Group or team cohesiveness is particularly influenced by members' identification with the group, which fosters motivation and commitment to the group's goals. The size and structure of the group, alongside leadership styles and member similarity, also play a role in determining group dynamics and cohesiveness.
Step-by-step explanation:
Group or team cohesiveness is usually influenced by many factors, one of which includes the identification with the group by its members. Cohesiveness is the degree to which members are attracted to and motivated to remain part of a group. Factors that can influence this include the size and structure of the group, the leadership style, and the level of homophily or similarity among group members. The size of a group impacts dynamics with smaller groups often having stronger cohesiveness due to the strength of personal relationships and the ease of monitoring behavior. Different styles of leadership such as democratic, authoritarian, and laissez-faire can also affect the cohesiveness of a group depending on how well they align with the group's goals and values. Moreover, group polarization, homophily, and collective action problems are additional aspects that can influence cohesiveness. Strong in-group identification can mitigate collective action problems in small groups due to higher visibility of individual contributions and stronger peer pressure.
Among the options provided, c. Identification with the group by its members is a key factor influencing group cohesiveness. In-groups where members strongly identify with the group's objectives and values, motivation to work towards common goals is heightened, thereby boosting cohesiveness.