I am not able to answer without the answer choices, but any resource that are bias are not reliable.
D the age of the buildings in the region
The correct option is A.
Disengagement theory refers to the manner in which older adults make necessary adjustments to aging by detaching themselves from their social roles in order to prepare for their eventual death. The act of disengagement helps the orderly and gradual transfer of statuses and roles from one generation to the other thus ensuring stability and preventing abrupt chaos.<span />