Has been found to be the most frequently cited reason for expatriate failure in u. s. and european companies.

The correct answer is Inability of the spouse to adjust to the new environment.

When workers go to the United States from Europe and take their families there, or when the situation is vice-versa, the spouses usually have a difficult time accepting and adapting to these changes. Kids just go to school and it gets sorted out quickly but spouses go to a new place where they don't have a job or friends or anything and it causes issues.