Juanita Decided to Study the Differences Among Students Who Choose

Multiple Choice

Juanita decided to study the differences among students who choose different majors.Everyone in her study,however,has chosen sociology as a major.Which one of the following can be said about her concept of choice of major?

A) She needs to study more people.
B) She can go ahead and do her study relating the two variables.
C) She really has only one concept.
D) One of her variables isn't really a variable because it has only one attribute.
E) It is not a major.