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Перевод задания: Какой вариант излишний в ряду? И почему?

a) Italy (because it's a country while others are cities);
b) Paris (because it's a French city while others are American);
c) Africa (because it's a mainland while others are countries);
d) London (because it's a city while others are football teams);
e) skiing (because it's a winter game while others are summer games);
f) Michael Jordan (because he's a basketball player while others are football players).