What would probably not be a reason that this is happening?

You are trying to launch an EC2 instance, however the instance seems to go into a terminated status immediately.

What would probably not be a reason that this is happening?
A . The AMI is missing a required part.
B . The snapshot is corrupt.
C . You need to create storage in EBS first.
D . You’ve reached your volume limit.

Answer: C

Explanation:

Amazon EC2 provides a virtual computing environments, known as an instance. After you launch an instance, AWS recommends that you check its status to confirm that it goes from the pending status to the running status, the not terminated status. The following are a few reasons why an Amazon EBS-backed instance might immediately terminate:

You’ve reached your volume limit. The AMI is missing a required part. The snapshot is corrupt.

Reference: http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/Using_InstanceStraightToTerminated.html