You are implementing an ASP.NET application that uses LINQ to Entities to access and update the database.The application includes the following method to update a detached entity of type Person. You need to implement the UpdatePerson method to update the database row that corresponds to the personToEdit object. Which code segment should you use？（）
- A_entities.People.Attach（personToEdit）； _entities.ObjectStateManager.ChangeObjectState（personToEdit， EntityState.Modified）； _entities.SaveChanges（）；
- B_entities.ObjectStateManager.ChangeObjectState（personToEdit， EntityState.Added）；_entities.SaveChanges（）；
- C_entities.People.ApplyCurrentValues（personToEdit）； _entities.SaveChanges（）；
- D_entities.People.Attach（new Person（） { Id = personToEdit.Id }）；_entities.ObjectStateManager.ChangeObjectState（personToEdit， EntityState.Modified）；_entities.SaveChanges（）；