Alegal document issued by a nation that identifies a person as a citizen of that nation is called a

The correct answer is - citizenship.

The citizenship represents a legal relationship between a particular country and an individual. Usually the country in question is a country where the individual has been born, lives, works, or got married, and in turn the individual get protection from that country and is able to live there.

Take in notice that not all countries have citizenship as an official document, some just do it by using ID cards, or passports, while some countries do have a special official document that confirms the citizenship.

answer; (a) he was a u.s senator for 38 years;

d is the best answer for this question.