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

How to protect your dog around natural water sources
Refrain from letting your dog drink the water.
When you take your dog to outdoor water sources, you should prevent them from drinking the water as best as you can. Any outdoor water source may contain bacteria that can make your dog sick.

Select from: (I) A dog who is going to drink the water could, even worse, have a fatal bacteria within their bodies. Stay away from running water, which may contain bacteria.. (II) The water may contain chemicals that can make your dog sick. Keep your dog away from any blue-green algae.. (III) Place your dog in a metal container or plastic basket. You can also use a plastic or glass container.. (IV) These bacteria can even be fatal for dogs. In order to protect your dog from these bacteria, you should keep your dog under water until you take her to the water source..
The answer is:
(II)