Universal Container Salesforce manager wants to move and deploy custom fields and objects from the salesforce sandbox environment to the production environment. What is the best approach for him to do this deployment?

Answer options:

A.Install data loader and import all the fields and objects from the sandbox environment to production
B.Install an App Exchange unmanaged package and move all the custom fields and objects to production
C.Access changesets through setup and deploy the custom fields and objects from sandbox to production
D.Install an App Exchange managed package and move all the custom fields and objects to production

Correct Answer: C 
Use change sets to send customizations from one Salesforce org to another. For example, you can create and test a new object in a sandbox org, then send it to your production org using a change set. Change sets can contain only modifications you can make through the Setup menu. For example, you can’t use a change set to upload a list of contact records. Change sets contain information about the org. They don’t contain data, such as records. 
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. 
Options B and D are incorrect because an AppExchange package is a container for something as small as an individual component or as large as a set of related apps. After creating a package, you can distribute it to other Salesforce users and organizations, including those outside your company. 
Reference: 

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