How depression is caused by exposure to the stress hormones cortisol

 Dr. Bialik reads about a new theory that suggests depression is caused by exposure to the stress hormones cortisol in the womb. To test this theory, she conducted a study comparing the cortisol level in amniotic fluid of individuals who were later diagnosed with depression and the cortisol level of those who did not develop depression. Dr. Bialik found no differences in amniotic fluid cortisol levels between the groups. Based on these results, Dr. Bialik should conclude that Group of answer choices there is no way to prove the theory because of flaws in the methodology used by Dr. Bialik to test her theory. she has disproved the previous theory because the lack of findings contradict her theory. there may be unexamined factors influencing the results that contributed to the results of other studies on this topic. previous studies that support the theory are probably flawed.