Final answer:
Statement C: "Sarah, will you be in charge of research and Mark will you put together the presentation?" reflects a social role.
Step-by-step explanation:
A social role refers to the set of expectations, behaviors, and responsibilities that individuals in a society or a group are expected to fulfill. It guides people on how to act and interact in a particular social context. Out of the given options, statement C: "Sarah, will you be in charge of research and Mark will you put together the presentation?" reflects a social role. In this statement, Sarah is assigned the role of conducting research, and Mark is assigned the role of putting together the presentation, which is a clear example of social roles being assigned within a group.