Which of the Following Is True of Allostasis

Which of the following is true of allostasis?

A) The concept of allostasis states that just a single-level system in the body struggles to return to baseline at a time.
B) The concept of allostasis makes clear that our bodies can respond adaptively to challenge for only a short period of time.
C) The concept of allostasis explains the concept of gene expression and hierarchy that is reflected in our observable external behavior.
D) The concept of allostasis states that unless we are provoked, we maintain a standard optimal baseline state and cannot return to that same state after the stress.