People who sit and walk cannot also sleep and drink at the same time.
This justifies what answer for what question? Q & A: 
If "A group of people sit and walk on a set of stairs." does that mean that "A group of people sleep and drink on stairs."?
Options:
- yes
- it is not possible to tell
- no
no
People who sit and walk cannot also sleep and drink at the same time.
This justifies what answer for what question? Q & A: 
user
If "A group of people sit and walk on a set of stairs." does that mean that "A group of people sleep and drink on stairs."?
Options:
- yes
- it is not possible to tell
- no
no
assistant
People who sit and walk cannot also sleep and drink at the same time.
This justifies what answer for what question? Q & A: 
If "A group of people sit and walk on a set of stairs." does that mean that "A group of people sleep and drink on stairs."?
Options:
- yes
- it is not possible to tell
- no
no