In "Bystander's Three Options," Thomson Argues That the Bystander May

In "Bystander's Three Options," Thomson argues that the bystander may not permissibly kill one worker to save five because:

A) he is obligated to let nature run its course.
B) all lives are equally valuable and cannot be weighed against one another.
C) he must not kill another to save lives if he can do so by killing himself instead.
D) killing is unconditionally wrong.