In Cloudtrail what is the component that marks the record of an activity in an AWS account?

Answer options:

A.Cloudtrail workflow
B.Cloudtrail Event
C.Cloudtrail logs
D.Cloudtrail alarms

Answer - B
The AWS documentation mentions the following
An event in CloudTrail is the record of an activity in an AWS account. This activity can be an action taken by a user, role, or service that is monitorable by CloudTrail. CloudTrail events provide a history of both API and non-API account activity made through the AWS Management Console, AWS SDKs, command line tools, and other AWS services.
For more information on AWS Cloudtrail concepts, please visit the link:
http://docs.aws.amazon.com/awscloudtrail/latest/userguide/cloudtrail-concepts.html