This question asks you to identify the primary concern of the passage. The best answer is C. According to the first paragraph, the passage is about two different assessments of Florence Nightingale’s career. The first paragraph summarizes one of these assessments; the second paragraph presents a contrasting account of Nightingale’s career that contradicts the central point of the first account. Choice A is incorrect. Although the passage discusses various aspects of Florence Nightingale’s involvement in the field of nursing, it does not mention any innovations that she introduced to that field. Choice B is not correct because the passage does not discuss approaches to the writing of historical biography. Choice D is also incorrect. Although the passage refers to the specific problems of military medicine during the Crimean War and to the poor living conditions of British soldiers after the war, the passage does not discuss the broader, more general issue of the quality of health care in nineteenth-century England.