This is a test of commonsense with single/multi-choices. Complete the next sentence:

How to care for golden retrievers
Choose a high-quality food.
When looking for a dog food to feed your golden retriever, you should make sure that the product is " complete and balanced. " this means that the dog food has passed tests to ensure that it provides all of the necessary nutrition that your golden retriever needs to be healthy.

Options are: 1. You may also want to consider buying a breed specific dog food. Some pet food companies produce dog food specifically for large breed dogs, such as golden retrievers.; 2. The american kennel club recommends that you consider a food that is 100% high quality. That means that it should provide sufficient protein and low-phosphorus content to ensure your golden retriever's health.; 3. Look for a food that meets those requirements you were tested on. Look for a quality dog food that includes high levels of calcium.; 4. Humans are weak against the key vitamins, minerals, and magnesium important to a dog's health. Ensure that the dog food you pick is high quality.;
The answer is:
1.