Dependent Variable Example- Stem a Psychologist Is Conducting a Study

Dependent variable example- stem A psychologist is conducting a study on the effect of intergenerational contact on happiness ratings,focusing on how such contact can be beneficial to older adults..In one condition,she pairs an older adult with a young child and in the other she pairs two older adults with each other.Both sets of pairs meet for 30 minutes at a time.In this study,the dependent variable is the:

A) pairings of young with old vs.old with old.
B) happiness ratings of the older adults.
C) length of time spent in contact.
D) number of words each pair exchanges while they meet.