You are setting up cloudformation templates for your organization. The cloudformation template consists of creating EC2 Instances for both your development and production environments in the same region. Each of these instances will have an Elastic IP and a security group attached to them which will be done via Cloudformation. Your cloudformation stack for the development environment gets successfully created, but then the production cloudformation stack fails. Which of the below could be a reason for this.

Answer options:

A.You have chosen the wrong tags when creating the instances in both environments.
B.You hit the soft limit of 5 EIPs per region when creating the development environment.
C.You hit the soft limit for security groups when creating the development environment.
D.You didn’t choose the Production version of the AMI you are using when creating the production stack.

Answer - B
The most viable reason could be that you reached the limit for the number of Elastic IP`s in the region.
For more information on AWS EC2 service limits, please refer to the below link:
http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-resource-limits.html