According to the Foreign Corrupt Practices Act, it is.
OA. legal for U.S. firms operating in other countries to offer bribes if it
is legal in that country
OB. illegal for foreign firms to offer bribes to U.S. officials unless it is
legal in their home countries
OC. illegal for U.S. firms operating in other countries to offer bribes as
long as it is illegal in the U.S.
OD. unethical but not illegal for U.S. firms operating in other countries
to offer bribes as needed