What is the fastest way to delete accidentally created cases in Salesforce?

Answer options:

A.Data Loader
B.Apex
C.Import Wizard
D.Mass Delete Records

Correct Answer: D 
Mass Delete Records allow you to delete multiple reports or records at the same time. From Setup, enter Mass Delete Records in the Quick Find box, then select Mass Delete Records and click the link for the type of record to delete. Review the information that is deleted with the records. Specify conditions that the selected items must match, for example, “State equals California.” 
Option A is incorrect because Data Loader is a client application for the bulk import or export of data. Use it to insert, update, delete, or export Salesforce records. 
Option B is incorrect because Apex is a strongly typed, object-oriented programming language that allows developers to execute flow and transaction control statements on the Force.com platform server in conjunction with calls to the Force.com API. 
Option C is incorrect because the import wizard makes it easy to import data for many standard Salesforce objects, including accounts, contacts, leads, solutions, campaign members, and personal accounts.
Reference:

https://help.salesforce.com/articleView?id=admin_massdelete.htm&type=5