Read the following excerpt form Johanna’s blog. May 10, 2013

How to House-Train Your Puppy

So you have a cute new puppy, but it goes to the bathroom all over the house. Here are some tips for house-training your new dog. First, create an enclosed space where the puppy will stay when not being watched. It’s a good idea to put newspaper down in case she does have an accident. Make this space the place where the puppy will sleep. Dogs do not like to go to the bathroom where they sleep. Second, whenever the dog is let out of its space, bring her outside right away. Once she goes to the bathroom outside, reward her.

Which purpose is the mostly likely reason for writing this blog?

to argue
to entertain
to advertise
to instruct