Leo: If "A group of people riding a roller coaster upside down." does that mean that "A group of people rode a roller coaster but it stalled."?
Options:
- yes
- it is not possible to tell
- no
Mei: OK, So, let's think first...
Me:
A group of people riding a roller coaster upside down and others rode a roller coaster but it stalled.
Thus, the answer is no.