What is the effect of this policy?

An Amazon EC2 administrator created the following policy associated with an IAM group containing several users

What is the effect of this policy?
A . Users can terminate an EC2 instance in any AWS Region except us-east-1.
B . Users can terminate an EC2 instance with the IP address 10 100 100 1 in the us-east-1 Region
C . Users can terminate an EC2 instance in the us-east-1 Region when the user’s source IP is 10.100.100.254.
D . Users cannot terminate an EC2 instance in the us-east-1 Region when the user’s source IP is 10.100 100 254

Answer: A