Which of the following can be used with Amazon ECS to run containers without managing servers or clusters of Amazon EC2 instances?

Answer options:

A.AWSVPC
B.FARGATE
C.AWS ECR
D.Docker

Answer: B
For detailed information on AWS ECS Launch types, refer to documentation here. 
https://docs.aws.amazon.com/AmazonECS/latest/developerguide/launch_types.html
For Option D, Docker is a container type, not a launch type. Amazon ECS uses Docker images in task definitions to launch containers on EC2 instances in your clusters.
 https://docs.aws.amazon.com/AmazonECS/latest/developerguide/docker-basics.html