Final answer:
In assessing harm under the Harm Principle and Duty to Rescue, the baseline for comparing actions is whether they infringe upon the rights and well-being of others.
Step-by-step explanation:
In assessing harm under the Harm Principle and Duty to Rescue, an action should be compared against a certain baseline. The harm principle, as advanced by John Stuart Mill, states that laws should not restrict the freedom of adults as long as their actions do not harm others. Therefore, the baseline for assessing harm would be whether the action infringes upon the rights and well-being of others. For example, if an action like telling the truth would cause harm to someone, it would be considered in violation of the duty to rescue and the baseline of not causing harm to others.