Correct answer is B
Page 14 of the vSpere Availability - VMware vShpere 6.7 adobe file
https://safe.menlosecurity.com/doc/docview/viewer/docN7FEECA32A01A5880a6572bb25393c963af4f5cbf0ad556a688b260c5ea77cdd58a643ace8c7c
"Note: Your cluster must use vSphere DRS for the Proactive HA failure monitoring to work."
You can configure how Proactive HA responds when a provider has notified its health degradation to vCenter, indicating a partial failure of that host.
**This page is editable only if you have enabled vSphere DRS.**
https://docs.vmware.com/en/VMware-vSphere/6.7/com.vmware.vsphere.avail.doc/GUID-3E3B18CC-8574-46FA-9170-CF549B8E55B8.html
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