Cultural historian: Universal acceptance of scientific theories that regard human beings only as natural objects subject to natural forces outside the individual' s control will inevitably lead to a general decline in morality. After all, if people do not believe that they are responsible for their actions, they will feel unashamed when they act immorally, and a widespread failure of individuals to feel ashamed of their immoral actions is bound to lead to a general moral decline. The conclusion drawn by the cultural historian follows logically if which one of the following is assumed? ['People who have a sense of shame for their moral transgressions will feel responsible for their actions.', 'Human beings who regard themselves only as natural objects will as a result lose their sense of responsibility for their actions.', 'Some scientific theories hold that human beings are not responsible for their actions.', 'Science does not enable human beings to control natural forces.']