Which of the following terms refers to the act of sending back?

The term that refers to the act of sending back is derived from the root "miss/o," which originates from Latin. In medical terminology, "miss/o" relates to the concept of sending or throwing away. While the other roots may have specific meanings related to death, fungi, or mutation, "miss/o" specifically conveys the idea of sending, which aligns with the definition required for the term "sending back." Therefore, it is the most appropriate choice in this context, as it accurately captures the intended action of returning or sending something back as part of its definition.