Sociology is best defined as the study of

sociology. the science, or discipline, that studies societies, social groups, and the relationships between people, structure of societies social relationships, Humanistic Perspective, Scientific Perspective Sociological Imagination, Psychology, and  Economics.

B. Their background or traits,rather than their individual performance

Explanation:

A -> B

They move with the concentration gradient (high->low). Therefore, they will move from inside the cell, A, to outside the cell, B.