Final answer:
Primary lymphedema can be an inherited condition because it can be caused by genetic mutations and is present from birth or early life, unlike secondary lymphedema or mononucleosis, which are not inherited.
Step-by-step explanation:
In biology, an inherited condition is a disease or disorder that is passed down genetically from parents to their offspring. Among the options provided, a. Primary lymphedema can be an inherited condition, particularly when it is caused by mutations in specific genes. It is a type of lymphedema that is present at birth or develops shortly thereafter, without an external cause. It is different than secondary lymphedema, which is not inherited but instead occurs due to damage to the lymphatic systems, such as after surgery or infection. Conversely, mononucleosis is an infectious condition caused by the Epstein-Barr virus and not genetically inherited.