Multi-choice problem: Continue writing the next sentence in this paragraph:

How to choose safe pet food 
Find the list of ingredients on the bag. 
The first 5 to 10 will play a significant role in the nutritional make-up of a food; however, it's important to remember that pet food labels provide limited information regarding the nutritional value of a food. Labeling regulations do not allow manufacturers to describe the quality of ingredients on the package.

Select from the following. --In fact, this does not require a owner to specify any is nutritionally suitable. Here are some basic tips and tricks to keep in mind : Never let the dog directly eat a food that's not nutritionally good.; --A reputable pet food manufacturer will be able to explain to you their specific methods for evaluating and assuring the quality of ingredients used in their products. Identify the source/sources of protein.; --Do some research online before making your choice of dog food. You'll be better served if you find out a trustworthy source to send it to.; --Thus, some companies may issue trial tests to determine if a food contains certain nutritional additives that would not be considered safe. Using a food label that is 40 percent degrade is usually sufficient for satisfying consumer cravings.;
A reputable pet food manufacturer will be able to explain to you their specific methods for evaluating and assuring the quality of ingredients used in their products. Identify the source/sources of protein.