Mark the letter A, B, C, or D to indicate the correct response to each of the following exchanges. Two friends Nam and Lan are talking about the topic of healthy lifestyle and longevity.
Lan: Do you think it's important for young people to keep fit? - Nam: ____
A. Why do they need to keep fit?
B. It's very important for old-aged people to have a healthy lifestyle.
C. I do think so. As the main labour force of the country, they must be strong.
D. It doesn't cost much to work out in the gym these days.
