Typically, Most Positions Are Filled by Local Nationals

Typically, most positions are filled by local nationals. This is probably because

A) it is a requirement to recruit personnel who can manage global organisations.
B) it is usually more expensive to hire nationals of the host country than to send in expatriate staff from Australia.
C) local personnel are more familiar with the head office corporate culture.
D) there are often restrictions or even total prohibitions on the hiring of home-country personnel in the foreign locations.