In Milgram's experiment: A. two-thirds of people refused to participate. B. the "learner'sometimes had lasting injuries. C. almost no one went to 450 volts. D. almost two-thirds of participants went all the way to 450 volts.

The correct answer is:<br /><br />**D. almost two-thirds of participants went all the way to 450 volts.**<br /><br />### Explanation:<br />Milgram's experiment, conducted by psychologist Stanley Milgram in the 1960s, was designed to study obedience to authority figures. Participants were instructed to administer electric shocks to a "learner" (who was actually an actor and not receiving real shocks) whenever the learner gave incorrect answers. The voltage levels increased with each wrong answer, going up to a maximum of 450 volts.<br /><br />Key findings from the experiment:<br />- **Approximately 65% (almost two-thirds) of participants obeyed the authority figure and administered the maximum shock of 450 volts**, despite hearing the "learner" protest or scream in pain.<br />- This demonstrated that ordinary people are capable of following orders from an authority figure, even when those orders conflict with their personal morals.<br /><br />The other options are incorrect because:<br />- **A:** Two-thirds of people did not refuse; instead, they complied with the instructions.<br />- **B:** The "learner" was an actor and did not suffer any actual injuries.<br />- **C:** Almost no one stopping at 450 volts is false; most participants went all the way to 450 volts.