Professor Pugsworth Examined the Following Types of Marital Status: Married/common-Law,single-Never

Professor Pugsworth examined the following types of marital status: married/common-law,single-never married,widowed,separated/divorced.The types of marital status are called the professor's

A) variables.
B) variable categories or attributes.
C) units of analysis.
D) theoretical elements.
E) sampling units.