One not concerned with right or wrong

In these questions, out of the four alternatives choose the one which can be substituted for the given words/sentence.

One not concerned with right or wrong

(1) moral (2) amoral
(3) immoral (4) immortal

Answer :-

(2) amoral

Explanation :-

amoral (Adj.) : not following any moral rules and not caring about right/wrong
moral (Adj.) : concerned with principles of right and wrong behaviour
immoral (Adj.) : not considered to be good or honest by most people
immortal (Adj.) : that lives or lasts forever