You need to use the Organization service to create a new Dataverse record. You want the duplication rules to be applied, and duplicate detection properties enabled for the account entity. Your code should be able to catch if the new record has a duplicate. 
What approach should you use for the record creation?

Answer options:

A.Early-bound style
B.Late-bound style
C.CreateRequest
D.ExecuteTransactionRequest

Correct Answer: C 
The Dataverse provides two web services to work with data using code: data service and Organization service. You should use the Web API if you work with the Dataverse data service. And for the Organization service, you use the .Net SDK API. If you are using the Organization service for the Windows project, you need to use XRM Tooling assemblies. 
When you work with Dataverse data using the Organization services, there are two coding data styles: the early-bound and late-bound. The early-bound approach checks the types during the compilation time. It uses the metadata for a class generation. The late-bound checks the types only when the object is created, or actions rendered. The late-bound style required to use the Entity class. The late binding helps to work with the custom entities and attributes that were not available during the compile-time. 
Here is a C# code example for early binding. 

And here is an example of late binding. We are using Entity class with a logic name of the entity. 

You also can create entities using the CreateRequest class. Instead of using the IOrganizationService.Create method (in the above examples: Guid accountid = svc.Create(account)), you use IOrganizationService.Execute method to execute a request for the Target entity in the CreateRequest() call. 

The benefit of using the CreateRequest is that you can add a request parameter for revealing the record duplication and catching it as an error exception. You can use any of the bindings for an account object. 

All other options are incorrect. 
For more information about using the Dataverse data operations using the Organization service, please visit the below URLs: 

https://docs.microsoft.com/en-us/powerapps/developer/data-platform/work-with-data
https://docs.microsoft.com/en-us/powerapps/developer/data-platform/org-service/entity-operations-create
https://docs.microsoft.com/en-us/powerapps/developer/data-platform/org-service/detect-duplicate-data#use-suppressduplicatedetection-parameter-to-throw-errors-when-you-create-or-update-record