Which comparison does the allusion to niobe make? neither antigone nor niobe were of royal blood. both antigone and niobe mourn the loss of family. neither antigone nor niobe had children. both antigone and niobe were punished by a god.

The correct answer is:  

Both Antigone and Niobe mourn the loss of family.

Apollo killed Niobe's sons and Artemis killed Niobe's daughters. Niobe was metamorphosed into a stone on Mount Sipylus in her motherland of Phrygia, where she pondered over the misfortunes sent by the gods. In Sophocles' Antigone, the heroine fears having a similar death.

jefferson introduced the idea that one does not change a government for "light" causes because he wanted to emphasize the seriousness of colonists' reasons for declaring independence.

the following key ideas correctly express the key sentence.

restate key idea: most people can learn to swim in ten short lessons.

restate key idea: the majority of water-accident victims require mouth-to-mouth breathing.

restate key idea: an empty, tightly closed gallon jug will support a tired swimmer.  

restate key idea: first aid is to prevent accidents as well as assist in rescue.

explanation: the key idea needs to have the same topic as the key sentence (drowning and safety).