The correct answer is B. irrelevant.
An amoral issue is one that is not concerned with morality. It is a matter of fact, not a matter of right or wrong. For example, the question of whether the Earth is round or flat is an amoral issue. There is no moral right or wrong answer to this question.
A moral issue is one that is concerned with right and wrong. It is a matter of values, not facts. For example, the question of whether it is right to kill another person is a moral issue. There are different opinions on this issue, and there is no single right answer.
An immoral issue is one that is considered to be morally wrong. It is a matter of ethics, not values. For example, the question of whether it is right to steal is an immoral issue. There is a general consensus that stealing is wrong, and there is no single right answer to this question.
In the given question, the issue is not concerned with morality. It is a matter of fact, not a matter of right or wrong. Therefore, the correct answer is B. irrelevant.