Which of the Following Is Not a Way for a Country

Which of the following is not a way for a country to use IFRS?

A) Require foreign companies listed on that country's stock exchange to use IFRS for consolidated financial statements.
B) Allow foreign companies listed on that country's stock exchange to use IFRS.
C) Permit its domestic companies listed on that country's stock exchange to use IFRS.
D) Adopt IFRS as that country's national GAAP.
E) Prohibit the use of a country's national GAAP.