You Would Use Variable Respecification Under Which Circumstance

You would use variable respecification under which circumstance?

A) to create new variables that are composites of several other variables
B) to adjust the sample so that greater importance is attached to respondents with certain characteristics
C) to compare attitudinal scores measured on a seven-point semantic differential scale with lifestyle or image scores measured on a five-point Likert scale
D) none of the above