A developer wants to import 500 Opportunity records into a sandbox. Why should the developer choose to use Data Loader instead of Data Import Wizard?

The primary reason to choose Data Loader over the Data Import Wizard for this task is object support. The Data Import Wizard is a simplified, web-based tool that supports a limited set of standard objects, which includes Accounts, Contacts, Leads, and Solutions, but notably excludes Opportunities. Data Loader is a more powerful client application that can perform DML operations on all standard and custom objects, including Opportunities.

A. Data Loader automatically relates Opportunities to Accounts.: Both tools can relate records using Salesforce IDs, so this is not a unique advantage of Data Loader. The user must provide the correct Account ID in the import file.

B. Data Loader runs from the developer's browser.: This is incorrect. The Data Import Wizard runs in the browser. Data Loader is a separate client application that must be installed on a local machine.

D. Data Import Wizard can not import all 500 records,: This is false. The Data Import Wizard supports importing up to 50,000 records at a time, so a batch of 500 is well within its limit.

1. Salesforce Help. "Import Data with the Data Import Wizard". The "Objects You Can Import" section lists the supported standard objects, which does not include Opportunity.

2. Salesforce Help. "Data Loader". The overview states, "You can use it to insert, update, delete, or export Salesforce records... for objects that are not yet supported by the import wizards."

3. Salesforce Help. "Compare Data Import Tools". This comparison table clearly shows that the Data Import Wizard does not support the Opportunity object, while Data Loader does.