Life, property, justice and modesty: Comprehension

In «أَحْسَنُكُمْ قَضَاءً», what does «قَضَاءً» clarify?

Respect for Life and Property, Justice, Modesty, and the Rights of Others (Accounts 18–22)

• Which physical place to occupy
• Which guest to greet
• The area of excellence: repayment
• Which animal has a better color