The population of blue fin tuna has dropped greatly because fishermen are ignoring fishing limits. Why do fishermen illegally catch too many blue fin tuna?

A.
It is a beautiful species of fish that is commonly used for household decoration.
B.
Fishermen are accidentally catching blue fin tuna while fishing for other species.
C.
Blue fin tuna are predators of a valuable fish that fisherman want to catch.
D.
Blue fin tuna are considered a delicacy in many places, making them quite valuable.

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: