Answer: aws ec2 run-instances

The correct answer is D. The 'aws ec2 run-instances' command is used to create a new EC2 instance using the AWS CLI. This command requires parameters such as the AMI ID, instance type, security groups, and key pair. Other options do not start a new EC2 instance: 'aws ec2 bundle-instance' creates a new bundle of an instance store-backed Windows instance, 'aws ec2 start-instances' is used to start an instance that has previously been stopped, and 'aws ec2 confirm-product-instance' is used to confirm if a product code is associated with an instance.

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