Answer& explanation
A. Opinion polls are usually used to receive the public opinons by conducting a set of questions usually online.
B. Sampling In research refers to gathering a number of people, objects or items from a larger population , the sample must represent the poulation at large so that the discovered findings can be used to generalize for the whole population from which the sample was taken.
C. biases of polling are social desirability effect which refers to the fact that people or survey participants tends to choose those answers that they believe are social acceptable even if they may not be true and the bandwagon effect
C.
Social desirability: this is when survey respondents in the opinion polls say something that is inaccurate because the truth may not be socially acceptable--such as lying about how many times they smoke cigarettes a day
bandwagon effect: refers to supporting someone not because you have logical reason to do so but because they seem to be ahead of everyone in the polls; it's like going with the winning team.
