You need to import data into Dataverse using Excel. 
What recommended tool should you use to guarantee that your import columns are the right type and have the correct names?

Answer options:

A.Power Query
B.Data Import Wizard
C.Data template
D.Azure Data Factory
E.Dataflows

Correct Answer: C 
Dataverse provides many ways to import and export data. They include Data Import Wizard, Power Query, Power Automate, Dataflows, and others. 
If you need to import your data using Excel, the recommended way is to use the Data template for data preparation. 
You can download the template by following the Power Apps Advanced settings/Settings/Data Management path to the "Templates for Data Import" item. After you click on this item, you will select the table that you want to import data into and push the Download button on the new screen. Power Platform will download the template to your computer. 

The Data template is an Excel spreadsheet that provides the column names and information about their data types and validations, such as the maximum length for the text entries or the Whole number`s value range. 

You can copy the data from your data source into this template. After this, you are ready to import the data template file with your prepared data back into Dataverse using Excel as a data source. 
All other options are incorrect because they are tools for data import of already prepared data, and some of them are not suitable for an Excel import. 
For more information about Power Platform data import, please visit the below URLs: 

https://docs.microsoft.com/en-us/powerapps/maker/data-platform/data-platform-import-export
https://docs.microsoft.com/en-us/power-platform/admin/download-template-data-import