Read the blog post from Ben’s Doggone Dog Blog.

What’s the best way to get a pooch to behave? Reward him (or her)! Rewarding good behavior works better than punishing bad behavior (at least with dogs). Think about it. No one likes to be yelled at, and that includes canines! Dogs are a lot happier if their owner isn’t yelling, “STOP BARKING!” My dog Corky barks a lot. So what I do is this: If he stops barking when I ask him to, I make a little tiny clicking sound with a clicker (like a castanet) and give him a treat and say, “Good doggie.” This encourages him to behave.

Which multimedia feature should Ben include to support his claim?

video of Corky barking even when Ben asks him to stop
video of Ben giving Corky a treat after he stops barking
pictures of Corky and Ben playing in the backyard
pictures of Corky enjoying treats that Ben gave him

Explanation: A supporting claim is any argument that will make it easier to prove the primary claim. Sometimes, this involves making a distinct argument that only helps to prepare an audience. More often, it involves establishing a piece of fact (evidence.)

In this situation, Ben is making a claim that Rewarding the Pooch get's them to behave. He should use evidence of him giving the Pooch a treat to provide proof of this.