It's clear guys search for it

https://portal.nutanix.com/page/documents/details?targetId=Web-Console-Guide-Prism-v6_5:wc-analysis-dashboard-wc-r.html#:~:text=A%20metric%20chart%20monitors%20a,color%20from%20the%20displayed%20palette. Chart definitions. The pane on the left lists the charts that can be run. No charts are provided by default, but you can create any number of charts. A chart defines the metrics to monitor. There are two types of charts, metric and entity. A metric chart monitors a single metric for one or more entities. An entity chart monitors one or more metrics for a single entity. 3 containers - 3 enitities

confused by the comments, did the answers get switched around ? Answer as of today is A - Metric chart

Entities are used for host or virtual machine.

C - An entity chart monitors the performance of one or more metrics for a single entity (physical or virtual entity). For example, you can create a chart that monitors a particular host, for metrics such as Physical Usage, Free Physical Storage, and Total Memory Usage (including HA).

Entities are used for host or virtual machine. Metrics are used for IOPs, latency, or bandwidth. So correct answer is "C" as storage would be on the "host".

metric chart means that we can only have one metric in a chart

An administrator can create an Entity Chart to view the logical usage for multiple storage containers in one chart. This chart can be created from the Prism Element dashboard, and it provides a visual representation of the logical usage of each container, allowing administrators to easily compare the usage of multiple containers at once.