Answer: In this scenario, Caroline is demonstrating an expectation of RECIPROCITY.
Explanation: RECIPROCITY is any scientific system that expresses various mutual relationships for the behavior of a physical system. It is a relationship of mutual dependence or action or influence.
Like in the question, Caroline expects that her professor takes into consideration when calculating her grades her work with underprivileged children. This is an example of mutual action which is what reciprocity illustrates.