Correct Answer: Unbiased

Solution : The correct answer is the fourth option .

Partial means favouring one side or party more than the others; showing favouritism, while unbiased means free from bias or favouritism; treating all sides equally.

The meanings of the other options are as follows:

• Unjust: Lacking justice or fairness.

• Prejudiced: Having a preconceived opinion or bias; not impartial.

• Doubtful: Uncertain or unsure.