Read the following directions on a bottle of medicine:     "Take two tablets with water, followed by one tablet every eight hours, as required, For maximum night-time and early morning relief, take two tablets at bed - time, Do not take more than six tablets in twenty-four hours.      For children six to twelve years old, give half the amount for a grownup. For children under six years old, ask for your doctor's advice.     Reduce the amount if nervousness,  _ , or sleeplessness occurs," The directions on this medicine bottle clearly warn the patient not to take more than   _  .
twenty-four tablets a day. eight tablets a day. six tablets a day. three tablets a day.