Which condition makes the "SELECT * FROM Customers WHERE state = 'MN'" query valid?

The query "SELECT * FROM Customers WHERE state = 'MN'" is valid because it is structured to filter the results from the Customers table specifically based on the condition that the state column must equal 'MN'. This means that the query retrieves all columns (indicated by the asterisk) for those records where the state is Minnesota. The purpose of this SQL statement is to retrieve a subset of data from the full dataset, focusing on the relevant entries that meet the criterion specified in the WHERE clause.

In the context of this query, the other options do not align with its execution. For instance, if there were no customers from Minnesota, the query would still be valid, but it wouldn’t return any results. Also, if customers needed to be from a different state, that would contradict the intent of the WHERE clause, which aims to find customers specifically from Minnesota. Lastly, the query does not focus on retrieving rows with blank entries; it explicitly looks for a specific value in the state column, further validating that option C is the correct choice.