A brief reading of the sentences tells us that the paragraph is about the different conceptions of relationships. 2 explains that communication is an important aspect here, and should be studied properly. 3 mentions a Foucauldian approach, that goes beyond this, and includes macro level regimes of truth. 1 then explains why the concept of regimes of truth is relevant here. 4 then aptly concludes the paragraph, implying how the micro practices within the relationships allude the importance of knowledge/power. Thus, the correct sequence would be 2314.