I believe the answer is: Bias the sample
Convenient timing and biased title would most likely make the study to appeal to a specific segment of population, which could make a the sample become biased.
For example, researchers could make the majority of their subjects to be younger in age if they conveniently timed the study in the middle of the night, when most middle aged and older people are already asleep.
A-- Initiative.
Referendums have to do with only addressing a single, specific issue.
Federalist systems have to do with having a representative head to the government.
Supremacy clauses have to do with which laws are superior to others in case of conflict. (Federal law is superior, by the way.)
The people who most likely to use lassos, lariats, steel spurs, and saddles were the cowboys and the gauchos. They used these to go on cattle drives, and normal everyday things back in those times. Horses were the main mode of transportation and saddles were a must. The correct answer is D.
Market because they are exchanging
.
HI
D) Christianity and Islam