In Investigating the Role of Oxytocin as an Antistress Hormone

In investigating the role of oxytocin as an antistress hormone, researchers sought to explore the relationship between childhood maltreatment, PTSD (post-traumatic stress disorder) and oxytocin levels. One study measured the level of oxytocin (pg/mL) in people who had and had not experienced childhood maltreatment and who did and did not have PTSD. The results, averaged over many subjects, are these:
Levels of oxytocin (pg/mL) in people who had and had not experienced childhood maltreatment and who did and did not have PTSD

$\begin{array} { l c l } & \text { PTSD } & \text { No PTSD } \\\text { Childhood maltreatment } & 983 & 669 \\\text { No childhood maltreatment } & 388 & 752\end{array}$
-A reasonable conclusion from this study would be

A) a range of experiences and life conditions probably affect oxytocin levels.
B) people manage PTSD better if they have higher oxytocin levels.
C) people who have been mistreated as children are more likely to suffer from PTSD.
D) oxytocin levels are higher in people who have had childhood trauma.