Answer: "However, chores are building blocks for a firm foundation.”
Step-by-step explanation: A metaphor is a direct comparison between elements that aren't obviously related, it doesn't use the words "like" or "as" to make the comparison. Metaphors are often used to help create an image in the readers' minds. In the given speech we can see an example of a metaphor "chores are building blocks" is expressing how chores can help teens to learn maintenance skills for their future home.