Final answer:
Yes, EBS volumes can be attached to instances in any availability zone within the same region.
Step-by-step explanation:
Yes, EBS volumes (Elastic Block Store volumes) can be attached to instances in any availability zone (AZ) within the same region.
EBS volumes are designed to be highly available and provide durable block level storage that can be used with Amazon EC2 instances. When attaching an EBS volume to an EC2 instance, you have the option to select the desired availability zone.
For example, if you have an EC2 instance running in us-east-1a availability zone, you can attach an EBS volume to that instance from us-east-1b availability zone.