Which of the Following Is the Primary Reason for an Expatriate's

Which of the following is the primary reason for an expatriate's failure to function effectively in a foreign assignment?

A) Differing customer expectations on product features
B) Lack of synergy owing to ineffective team communication
C) Ineffectiveness of home-country skills in the foreign country
D) Inability of the manager's spouse to adjust to a different environment
E) Cultural differences leading to conflicts of interest