Dr Guavita Asked Fifty Smokers a Series of Questions About

Multiple Choice

Dr. Guavita asked fifty smokers a series of questions about their childhoods and then collected blood samples from them. He found a high correlation between levels of the stress hormone cortisol and amount of reported childhood trauma. Dr. Guavita's research shows that childhood trauma

A) causes high stress levels in adults.
B) causes high cortisol levels in adults.
C) may be related to stress levels in adults.
D) is unrelated to stress levels in adults.