Which of the following would be the BEST reason to use a virtual machine as a sandbox?

Using a VM as a sandbox provides an isolated environment where new or untrusted software can be run without affecting the host operating system or other applications. This isolation prevents malware, crashes, or misconfigurations from impacting the main system, making it safe for testing.

While VMs can contribute to efficient resource use by consolidating workloads, this is a general benefit of virtualization, not the primary reason for using a VM specifically as a sandbox.

Running multiple machines on the same hardware is a core feature of virtualization, but it describes the underlying technology rather than the specific purpose of using a VM as a sandbox for testing.

A VM by definition shares hardware resources, so using it to have dedicated hardware for a single system is incorrect and contradicts the nature of virtualization.