Peking and Beijing are . A famous rulers of the Han Dynasty
B the cities that mark the ends of the Great Wall
C two types of jade dragon bowls first made during the Shang Dynasty
D two ways to pronounce the name of the same city in China

Francine, a college freshman, has agreed to participate in a psychology research study. before she begins her participation, she reads a statement written by the researcher explaining the purpose of the research and the potential risks of participation. it also explains that francine is free to withdraw from the research at any time. in providing francine with this statement, the researcher has followed the ethical guidelines of for participants.