Come up with a question and reasoning that would justify this answer: it is not possible to tell
The question is: Given the sentence "There are groups of people in green or purple shirts gathered outside holding signs and purple balloons." can we conclude that "Group of people gathered outside to celebrate their boss birthday."?
Options:
- yes
- it is not possible to tell
- no
Step-by-step reasoning process: Gathering outside does not mean it is to celebrate their boss birthday.