Answer:
Their
Explanation:
The answer is their.
They showed us their project.
The third one. A person uses another's lack of knowledge as proof his argument is correct.
This may be helpful:
https://literarydevices.net/fallacy/
Answer:
<em>Did</em><em> </em><em>anyb</em><em>ody</em><em> </em><em>clean</em><em> </em><em>the</em><em> </em><em>room</em><em>.</em>