Why Might a Company Not Realize the Skills Acquired by an Expatriate

Why might a company not realize the skills acquired by an expatriate manager?

A) few of the skills are assessed in domestic performances.
B) many of the dimensions considered are hard to evaluate.
C) open-mindedness must be seen to be believed.
D) people from different cultures give and take appraisal feedback in different ways.
E) all of the above.