Asociologist is interested in seeing if people's satisfaction with their married life (very satisfied, somewhat satisfied, fairly satisfied, not satisfied) is associated with their parent's marital status (divorced, widowed, still married).

Parent's Marital Status                                

Explanation:

Parent's Marital Status is the most explanatory variable for the given observation.  

The marital status of the parents provides a helpful information in studying whether people are satisfied with the married life of theirs. It is associated with the couples's parents whether being still married, divorced or widowed.