Correct Answer: Impartial

Solution : The second option is the correct choice.

The word impartial specifically denotes the quality of being unbiased, neutral, and fair. In the context of an argument or dispute, being impartial means not favouring or supporting any particular side but rather approaching the situation with an open mind and fairness.

The meanings of the other options are as follows:

• Involved implies being connected, participating, or deeply engaged in a situation or activity.
• Biased means having a prejudiced or unfair inclination or prejudice towards a particular side, showing favouritism.
• Natural pertains to something that is in accordance with the usual course of nature.