One who resides in a country of which he is not a citizen

The correct answer is A. Alien.

An alien is a person who is not a citizen of the country in which they reside. The term can also be used to refer to extraterrestrial beings.

A native is a person who was born in a particular place or country.

A primitive is a person or thing that is in an early stage of development or progress.

A prodigal is a person who spends money or resources wastefully.

In the context of the question, the correct answer is A. Alien. This is because the question is asking for a person who resides in a country of which they are not a citizen. An alien is a person who is not a citizen of the country in which they reside.