Utilitarians believe in performing the right activities that spread happiness as well as promotes it. Any act is considered correct and good if it is beneficial for other people or population.
They also believe that any bad act only makes other people suffer.So,Any activity is considered wrong which cannot provide best outcome and benefit to people.
Other options are incorrect because killing people, lying or violation of regulation are not considered as the most naturally bad acts according to utilitarians.Thus, the correct option is option(d).
