Select the option that can be used as a one-word substitute for the given group of words.
A person who regards the whole world as his country

Correct option is A

The one-word substitute for "A person who regards the whole world as his country" is "Cosmopolitan."
· Meanings of the given words:
· Cosmopolitan: A person who is at home all over the world; a person who believes in the idea of universal citizenship.
· Pacifist: A person who believes that war and violence are unjustifiable.
· Contemporary: A person or thing living or existing at the same time as another.
· Celibate: A person who abstains from marriage and sexual relations.