I got this question wrong, what is the correct answer and why is it correct?

Question $6$

There is a trolley car racing down the track toward five

workers. The only way to avoid killing those workers is for

the trolley driver to pull a lever that changes the direction

of the trolley car onto a different track. On the second

track there is one worker who will be killed if the trolley

changes directions. The trolley driver thinks, "I follow the

law always. Is it illegal to change the direction of this train

and kill that other worker? I think the best way to follow

the law would be to follow the train schedule no matter

what." So he does not pull the lever to change the direction

of the train. Based on the information above, which of the

Ethical Theories did the trolley driver use to make the

decision?

$1.$ Utilitarianism

$2.$ Social Group Relativism

$3.$ Cultural Relativism

$4.$ Virtue Ethics

$5.$ Deontology