An Organization Is Setting a Website on the AWS VPC

An organization is setting a website on the AWS VPC. The organization has blocked a few IPs to avoid a D-DOS attack. How can the organization configure that a request from the above mentioned IPs does not access the application instances?

A) Create an IAM policy for VPC which has a condition to disallow traffic from that IP address.
B) Configure a security group at the subnet level which denies traffic from the selected IP.
C) Configure the security group with the EC2 instance which denies access from that IP address.
D) Configure an ACL at the subnet which denies the traffic from that IP address.