A Common Measure of Educational Attainment Includes Categories for Less

A common measure of educational attainment includes categories for less than high-school diploma,high-school diploma,some college,college degree,some postgraduate education,and
Postgraduate degree.These categories could be confusing or miss people who went to trade school or who earned any type of nontraditional degree.This measure would have problems with which of the following?

A) It might make people feel uncomfortable about answering the question.
B) It would have problems with precision,which would threaten reliability.
C) It would be hard to test the validity of this question.
D) It would be impossible to use the split-half method to check whether the measure is reliable.