Answer: d. Margaret Floy Washburn
Explanation: Margaret Floy Washburn by many is seen as a "founding mother" of the sociocultural perspective in psychology. The perspective studies various factors that affect human behaviour and psychology such as societal attitude, gender norms and roles, social structures, regional differences etc. and stresses on the fact that human learning is largely an outcome of a social process. The sociocultural perspective is used to describe awareness of circumstances surrounding individuals and how their behaviors are affected by their surrounding, social and cultural factors, in other words, the ways people interact with each other and the culture they live in play significant roles in shaping their mental abilities, behaviour, thoughts and feelings.