If Costco plans on continued success in Japan, whose citizens tend to take pride in being members of their family, circle of close friends, and their work organization, the warehouse club should focus on the cultural dimension.

The correct answer to the following question will be "In-Group Collectivism".

Explanation:

In-group collectivism becomes "the extent to which entities within their organizations or families demonstrate loyalty, pride, and cohesiveness"As certain, relational collectivism is expressed as an ideology in which collective unity is valuable and participants within the group are viewed as having equal representation.

Therefore, it's the right answer.