You currently have an Autoscaling group that has the following settings.

Answer options:

A.Change the Maximum capacity to 2
B.Change the Desired capacity to 4
C.Suspend the Launch process of the Autoscaling Group
D.Change the Minimum capacity to 2

Answer – A and C
You can temporarily suspend the creation of new instances by either reducing the maximum capacity to 2 so that the current instances running which is 2 matches the maximum limit.
Secondly, you can suspend the launch process of the Autoscaling Groups.
The AWS Documentation mentions.
Scaling Processes
Amazon EC2 Auto Scaling supports the following scaling processes:
Launch
Adds a new EC2 instance to the group, increasing its capacity.
Warning
If you suspend Launch, this disrupts other processes. For example, you can`t return an instance in a standby state to service if the Launch process is suspended, because the group can`t scale.
For more information on Autoscaling Suspend and Resume, please visit the below URL:
http://docs.aws.amazon.com/autoscaling/latest/userguide/as-suspend-resume-processes.html