For the first question regarding the elderly lady in the nursing home, the most appropriate conclusion would be Option D: Tertiary aging. Tertiary aging refers to the rapid decline in health that some individuals may experience in advanced age, often associated with psychological issues such as depression.
For the second question about Elizabeth Kübler-Ross’s book "On Death and Dying," the correct answer is Option B: Thanatology. Thanatology is the study of death and the practices associated with it, including the psychological and emotional responses to death and dying, which Kübler-Ross's work significantly contributed to.