Given the definition of the Country class: public class…

Given the definition of the Country class:
public class country {
public enum Continent {ASIA, EUROPE}
String name;
Continent region;
public Country (String na, Continent reg) {
name = na, region = reg;
}
public String getName () {return name;}
public Continent getRegion () {return region;}
}and the code fragment:
List<Country> couList = Arrays.asList (
new Country (“Japan”, Country.Continent.ASIA),
new Country (“Italy”, Country.Continent.EUROPE),
new Country (“Germany”, Country.Continent.EUROPE));
Map<Country.Continent, List<String>> regionNames = couList.stream ()
.collect(Collectors.groupingBy (Country ::getRegion,
Collectors.mapping(Country::getName, Collectors.toList()))));
System.out.println(regionNames);

A.
{EUROPE = [Italy, Germany], ASIA = [Japan]}

B.
{ASIA = [Japan], EUROPE = [Italy, Germany]}

C.
{EUROPE = [Germany, Italy], ASIA = [Japan]}

D.
{EUROPE = [Germany], EUROPE = [Italy], ASIA = [Japan]}