What is the scope of an EBS volume?
A.
 VPC
B.
 Region
C.
 Placement Group
D.
 Availability Zone
Explanation:
An Amazon EBS volume is tied to its Availability Zone and can be attached only to instances in the same Availability
Zone.
http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/resources.html
D
http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/resources.html