Which One of These Scenarios Are Ethical Issues

Which one of these scenarios are ethical issues?
(i) A company is thinking of employing a robot that will make most of the workforce redundant
(ii) Someone creates an AI
(iii) A judge decides to give someone a prison sentence
(iv) Someone hacks a computer

A) (i) and (ii)
B) (i) and (iii)
C) (ii) and (iii)
D) (iii) and (iv)