Answer: C. free bread and entertainment for the poor
Free bread and circuses during the time of the Roman emperors refer to the effort of emperor to appease the poor in their dissatisfaction. They did it by feeding the poor well and organizing leisure activities for them such as gladiator to entertain them. It is a form of bribery in its most subtle form.
Sand can be used for glass.
The Saint Valentine's Day Massacre is the name given to the death of seven people as part of a Prohibition Era conflict between two powerful criminal gangs in Chicago, Illinois, in the summer of 1929: the South Side Italian gang led by Al Capone and the North Side Irish gang led by Bugs Moran