The communicative structure, according to the Frankfurt school, that reflects the social order is called

Correct option is D

The Frankfurt School was a group of critical theorists associated with the Institute for Social Research in Frankfurt, Germany, who were noted for their critiques of society, culture, and mass media. They argued that the communicative structure that reflects the social order is culture. Culture, according to the Frankfurt School, is not simply a collection of shared beliefs and values, but is also a system of power that can be used to maintain the status quo.
Information booster: The other options are incorrect:
Custom: A custom is a social norm that is often based on tradition. Customs can be related to communication, but they do not reflect the social order in the same way as culture.
Convention: A convention is a rule or agreement that is made by a group of people. Conventions can also be related to communication, but they are more specific and limited in scope than culture.
Public sphere: The public sphere is a space where individuals can engage in rational discourse and debate about issues of public concern. According to the Frankfurt School, the public sphere is essential for a democratic society, but it is not the only communicative structure that reflects the social order.