The Textbook Describes a Study Where Researchers Collected Blood Samples

The textbook describes a study where researchers collected blood samples from newlywed participants while they discussed an important problem in their marriage.The blood samples were then analyzed for the presence of stress hormones.What is the most important conclusion from this study?

A) Although important,stress hormones were not as predictive of relationship status and quality 10 years later as were the negative behaviors partners displayed during these discussions.
B) Stress hormones were far more predictive of relationship status and quality 10 years later compared to the negative behaviors partners displayed during these discussions.
C) Observable features of conflict (e.g. ,negative statements,criticism) revealed all of the clues needed for predicting the status and quality of the relationship 10 years later.
D) Because they are largely within our conscious awareness,biological responses to conflict (i.e. ,changes in hormone levels) are particularly useful in predicting the status and quality of the relationship 10 years later.