Which of the below mentioned options is not a possible reason for this?

A user has launched an EC2 instance. The instance got terminated as soon as it was launched.

Which of the below mentioned options is not a possible reason for this?
A . The user account has reached the maximum volume limit
B . The AMI is missing. It is the required part
C . The snapshot is corrupt
D . The user account has reached the maximum EC2 instance limit

Answer: D

Explanation:

When the user account has reached the maximum number of EC2 instances, it will not be allowed to launch an instance. AWS will throw an ‘Instance Limit Exceeded’ error. For all other reasons, such as “AMI is missing part”, “Corrupt Snapshot” or ”Volume limit has reached” it will launch an EC2 instance and then terminate it.

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