Answer: C) “However, chores are building blocks for a firm foundation.”
Explanation: a metaphor is a figure of speech that consists in making a direct comparison between elements that aren't obviously related, in order to create an image in the reader's mind. In the given short speech we can see an example of a metaphor in the line "However, chores are building blocks for a firm foundation" where the speaker compares chores with building blocks, because of the skills and values they provide to children and teenagers.