Bias a) the relationship between two variables that can be observed and measured b) measures the opinions and attitudes of individuals in a society c) tendency to select samples that support the research d) data that has already been gathered from a larger population

Bias is influenced facts, experiments, research, etc- due to someone's personal view or opinion on something. Not an actual fact or piece of data. 

I would say "B" is the best answer since it states the opinions and attitudes of individuals in a society. 

Bias is a way scientists can make sure information is not influenced and can check to see if the research/facts are accurate. 

I hope this helps!
~kaikers

Hey there!

Bias measures the opinions and attitudes of individuals in a society, so your answer is going to be: Option B

Hope this helps
Have a great day (:

Just think, why was it effective? -it appeled to critics because it was written well, that made it noticeable to the public including the white population-it was also recognizable to the african americans because it was about their heritage.-it was powerful just keep finding more points and elaborate on them. message me if you need more