An Actuary Wishes to Predict the Life Expectancy of a Person

An actuary wishes to predict the life expectancy of a person based on several variables.One categorical variable of interest is their relationship status - single,married,divorced,widowed,or common-law.If the actuary wished to include "relationship status" in a regression model,how many indicator variables would he/she need to use in the model?

A) 4
B) 2
C) 3
D) 5
E) 1