You use a Microsoft SharePoint list to record information about customers.

You must perform a series of actions only when a new item is added to a SharePoint list.

You need to configure a Power Automate flow.

Which trigger should you use?

A. When an item is created

B. When an item is created or modified
C. When a file is created (properties only)
D. For a selected item

Explanation:
Trigger – When an item is created
Triggers when an item is created.
MS Flow will trigger when an item is created in the list. It will return all list item properties which can be used in the Flow.

Incorrect Answers:
D: Trigger – For a selected item
This trigger allows you to start a flow for a selected item in a SharePoint list or library. You can use the columns of the list or library as output parameters. For a file, you can use the “identifier” column to get file content.

This is basically one which will trigger a flow when an item is selected and you want the user to trigger workflow manually.

Reference:
https://www.c-sharpcorner.com/article/sharepoint-based-triggers-in-ms-flow-part-2/