When Berger & Luckman said that reality is socially constructed they meant ?

A. scientists are guided in their work by social values and interests, so they define and measure phenomena that will support their theories
B. people negotiate d definitions of their situation and live according to these often forgetting that these social worlds are not fixed and external
C. sociologists decide what constitutes social reality and measure only that
D. terms like reality have no deeper meaning beyond the level of discourse