The unlevered beta of the company is 0.75.
= Levered beta ÷ (1 + (1 - tax rate) × (Debt Equity))
= 0.90 ÷ (1 + (1 - 0%) × (($6000 - $5000) ÷ $5000))
= 0.90 ÷ (1 + 0.20)
= 0.90 ÷ 1.20
= 0.75
Therefore we can conclude that The unlevered beta of the company is 0.75.
Thus, all the other options are incorrect.
Learn more about the beta here: brainly.com/question/22354424