A Researcher Is Conducting a Survey on Canadian Immigration

A researcher is conducting a survey on Canadian immigration. She develops a three-category nominal variable to measure the homeland of newcomers to Canada with the following options: (a) originally from Southern Europe; (b) originally from South America; (c) originally from Southeast Asia. What is most clearly wrong with this scale?

A) The categories are not mutually exclusive.
B) The categories are not exhaustive.
C) The categories are not homogeneous.
D) This is actually an adequate scale.