In a study on happiness in marriage, participants were asked how long they
had been married. The time they had been married would be a in the
study.
A. sampling
B. correlation
C. variable
D. random assignment
SUBMIT

Respuesta :

Answer:

d

Explanation:

because it could be newly Weds or people that have been together for 40 years

this may not or may be correct just my answer

d this never happened