Which of the Following Is the Best Definition of Variability

Which of the following is the best definition of variability?

A) it is the amount of dispersion in a data set containing interval or nominal data
B) the difference between scores in the present sample and scores in a previous sample
C) the amount of dissimilarity in ordinal data
D) amount of dissimilarity (or similarity) in respondents' answers to a particular question
E) the amount of responses in one respondent's answers to a particular survey question