Answer:
C. Since people are working so hard at relaxing and watching television.
I'm sure the nation's problems will just disappear.
Step-by-step explanation:
Sracastic tones are used to give emphasis on a certain point that the speaker wants to make, and he makes a statement by saying exactly the opposite to what he thinks and what he wants to say. In this case he say that people work hard at relaxing and watching television, and as we know that is not commonly considered hard work, so the speaker is obviously using a sarcastic tone to exemplify the opposite of what he wants to say.