Which sales order preference is used to set a default warehouse for orders?

The correct answer is "Default Location SO" because this setting specifically designates a default warehouse or location for sales orders within the NetSuite system. When this preference is configured, it allows for a streamlined process by automatically selecting a particular warehouse for inventory allocation when a new sales order is created. This is particularly useful in environments with multiple warehouses, as it helps maintain consistency and reduces the time spent on selecting the warehouse manually for every order.

The "Default Shipping Location" typically refers to where the products are shipped from, which might not necessarily be the warehouse that fulfills the order. "Standard Warehouse Selection" is more of a general term and may not directly correspond to a configured setting within NetSuite. The "Default Inventory Warehouse" could sound relevant but is not the specific field used for defining the default warehouse for sales orders in the way that "Default Location SO" is configured to do.