What does the man say will be lost with the disappearance of a language?

Listen to the conversation, and mark each question as A, B, C or D according to your listening.
W: Predictions are dire that, by the end of this century, more than half of the world’s 6,000 languages will be gone. With today’s program we’re trying to explore tongues around the globe at risk of being lost forever and what is lost with them.
M: Each of these languages holds a little piece of information or a lot of information. And that’s information that, if you lose the language, you lose that connection with that place, with that way of thinking, with tens of thousands of years of that language’s lineage.
W: So what leads to the loss of some languages?
M: One cause of the loss of languages, of course, lives around the globe increasingly interconnected through technology, the economy, and the dominance of a few languages, including online.
W: Then what are the few dominant languages?
M: Well, it seems English, Mandarin and Spanish are gobbling up languages, as people decide they need to have this in order to assimilate into a culture.
W: What’s the key to a language surviving?
M: A language survives if you have the choice to learn it, if it’s available for you to live your life in some way with your language as part of you. In Wales, you have a choice of whether to go to an English medium school or to a Welsh medium school. And in this way, children can learn in the language that they are speaking at home.
W: But couldn’t you make the argument that it would be better if we all spoke the same language, that we all understood each other?
M: Well, language is the way we think. And it’s the way it’s been handed down through generations. If you begin to think in another language, that’s fine. But if you have to lose the way that your family has been speaking, that’s not so fine. That’s losing who you are. And when we lose who we are, that’s when we become this homogenized consumer of life, rather than a citizen who comes from a place and knows who you are.