Cloud Kicks needs to insert 25,000 records with deduplication for the Race_Track__c custom object. Here's the reasoning for choosing Data Loader:

Data Loader: This is the appropriate tool for importing large volumes of data (up to 5 million records) into Salesforce. It also provides deduplication options through Salesforce’s native matching rules or by implementing external checks. Data Loader is highly scalable, and for 25,000 records, it is well-suited because it can handle more than the Import Wizard's record limits.

Option A (Import Wizard): The Import Wizard is not a good choice here because it supports up to 50,000 records, which may seem acceptable. However, it is generally recommended for smaller data imports, and deduplication options are limited compared to what Data Loader offers. Additionally, for bulk operations like 25,000 records, Data Loader is more efficient and robust.

Import Wizard Limitations

Option B (Lightning Object Creator): This tool is used to create custom objects from spreadsheets and is not designed for bulk data loading or deduplication. It’s not appropriate for large data imports.

Option D (Schema Builder): Schema Builder is a tool used to view and modify the structure of objects and fields in Salesforce, not for data import or deduplication purposes.

In summary, Data Loader is the most appropriate tool for importing a large number of records with deduplication needs.