How Did Cabrera and Padilla's Research Reflect the Principle of Avoiding

How did Cabrera and Padilla's research reflect the principle of avoiding biased topics and questioning in research?

A) They asked generic questions that were unlikely to be viewed as biased.
B) They avoided studying factors that led to poor achievement and instead examined factors that promoted achievement.
C) They first asked the people being researched if their questions or topics were biased in any way.
D) They investigated public perception of the groups they were researching and asked about how to avoid poor achievement.