The third option uses the word ‘infer’ correctly.
Not too sure, but I think it’s the last option: This is a complex sentence because it joins an independent clause with a dependent clause
Taking a position in an argument means taking a side. When taking a side in an argument, the author will most likely give you biased evidence. They will only give you reason to believe their side, without giving you any sort of evidence for the other side in the argument.
I hope this helps!
