Which of these is the best explanation for the high population density in china's eastern regions?
a) the region is not capable of supporting large scale farming.
b) the region is close to the ocean and has a favorable climate.
c) the region was traditionally home to the emperor and the gods.
d) the region was destroyed by civil war which caused people to leave.

Dr. robbins wants to know if there are different opinions regarding the value of public school education between native americans who have at least one relative who attended indian boarding school and native americans who have no family experience with indian boarding school. dr. robbins contacts 35 native american participants in each group. he wants each group to include younger as well as older adults, and a mix of male and female participants. he asks each person to complete a survey about their attitudes toward public education. the design of this study is: