Answer: B) Yes, especially if the people who are on a do dash not dash call registry have a trait that is not accurately represented by the remaining people in the sample
If the person conducting the survey wants a good random sample then they should take opinions from a broad audience, including people from different backgrounds, races, ages, cultures etc. In this case, the people that are not on the call registry most likely have a common trait that would explain why they're not in there (ie. they're too young to be eligible to be in the call registry, they are too old to be on the call registry, etc). Not calling them then would throw off the sample. Because of this, B is the correct answer.
Answer:
C: Leaders have absolute power
Answer: Pioneers and settlers moved out west for different reasons. Some of them wanted to claim free land for ranching and farming from the government through the Homestead Act. Others came to California during the gold rush to strike it rich. Even others, such as the Mormons, moved west to avoid persecution.