Assume that all bundles mentioned in the answers exist and define the same keys.
Which one will be used to find the key in line 8?
6: Locale.setDefault(new Locale("en", "US")); 7: ResourceBundle b = ResourceBundle.getBundle("Main"); 8: b.getString("name");
B.
Java will first look for the most specific matches it can find, starting with Main_en_ US.java and then Main_en_US.properties.
Since neither is found, it drops the country and looks for Main_en.java.
Since a match is found, there is no reason to go on to the next one, which is Main_en.properties.