Answer - B
The AWS Documentation mentions the following
Amazon Linux AMIs may contain additional scripts installed by AWS, known as ec2-net-utils. These scripts optionally automate the configuration of your network interfaces. These scripts are available for Amazon Linux only.
For more information on using Elastic network interfaces, just browse to the below URL:
http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/using-eni.html