QUESTION: Billy was an astronaut. When he looked at the world from space, how did it look?
Options:
- diverse
- round
- square
- orange
- complicated
ANSWER: Let me think step-by-step: The world is round. Billy was an astronaut and it seems to be round when he looked at the world from the space. So the answer must be round.

QUESTION: What does a child want to do after school?
Options:
- wave goodbye
- play video games
- ask many questions
- clean street
- become adult
ANSWER: Let me think step-by-step: Playing video games is an activity. Children like to play video games. Playing video games needs a device. So the answer must be play video games.

QUESTION: Where is there typically small unpaved lanes?
Options:
- city
- rural countryside
- bowling alley
- highway
- estonia
ANSWER: Let me think step-by-step: Rural Countryside is the land and scenery of a rural area or the geographic area that is located outside towns and cities. There is typically a small unpaved lane in rural countryside. So the answer must be rural countryside.

QUESTION: What could customers do after you serve customers?
Options:
- clean hands
- smile
- scream
- polite
- make money
ANSWER:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Let me think step-by-step: Customers smile after you serve them. Smile is the only activity which customer can do after they have been served well. So the answer must be smile.