Final answer:
The correct answer is b. 5, as Data Loader can process up to five objects at a time during the import process.
Step-by-step explanation:
The Data Loader is a client application for the bulk import or export of objects. It allows you to insert, update, delete, or export Salesforce records. When it comes to importing objects, Data Loader can process up to five objects at a time. Therefore, the correct answer to the question is b. 5. Although it can process multiple objects concurrently, it's important to prepare each object and its related data appropriately to ensure a successful import process.