Final answer:
The correct phrase for the sentence is 'damage free,' meaning the product is without any harm and functions as intended. The other options such as defective, expired, or out of stock do not fit the context of ensuring a product is in good condition and operational.
Step-by-step explanation:
The correct phrase to complete the sentence "Test the product and make sure it is ________ and working properly." is damage free. This phrase means that the product is without any harm or injury and is functioning as intended. Testing a product to ensure it is damage free is important to both consumer satisfaction and to the maintaining of the manufacturer's reputation. When a product is defective, it has a fault or imperfection that prevents it from working properly. An expired product has passed its intended shelf life and may not function as expected or could be unsafe for use. If a product is out of stock, it means there are no more items available for purchase or testing at that moment. The key here is to confirm that the product is unblemished and operates as designed.