Marilyn, a 79-year-old widow, has been financially exploited by her neighbor. This type of exploitation is known as

Answer: Elder abuse

Explanation:

Elder exploitation is the type of abuse in which an elderly person is targeted for gaining finical benefits from them through false or illegal means and performing fraud act. It is caused to the vulnerable or disabled elder people and thus they are usually not aware about the unauthorized financial act.

According to the question, Marilyn is facing elder abuse exploitation in which she is illegally exploited in financial terms by her neighbor for their personal needs. As she is an elder and vulnerable as widow, neighbor took advantage of her situation.