In the "Bystander's Three Options" case, option (iii) is sacrificing oneself to save the five workers. Thomson says that option (iii) is

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Thomson argues that sacrificing oneself to save others can be considered a good deed, but it is not a moral obligation. This means that while it may be commendable to choose self-sacrifice to save others, one is not morally required to do so.

In the "Bystander's Three Options" Case, Option (Iii) Is Sacrificing