Which of the below AWS services allows you to increase the number of resources based on the demand of the application or users?

Answer options:

A.AWS EC2
B.AWS Autoscaling
C.AWS ELB
D.AWS Inspector

Answer - B
The AWS Documentation mentions the following:
AWS Auto Scaling enables you to configure automatic scaling for the scalable AWS resources for your application in a matter of minutes. AWS Auto Scaling uses the Auto Scaling and Application Auto Scaling services to configure scaling policies for your scalable AWS resources.
For more information on AWS Autoscaling, please refer to the below URL:
https://docs.aws.amazon.com/autoscaling/plans/userguide/what-is-aws-auto-scaling.html