Let's match each disease with its cause: A. Marasmus: A severe form of protein-energy malnutrition characterized by overall energy deficiency, often due to prolonged starvation or insufficient intake of both calories and protein. It matches "Prolonged Starvation" (1). B. Kwashiorkor: Another form of severe malnutrition, primarily caused by protein deficiency, often seen in children after weaning when their diet is primarily carbohydrate- based but lacks sufficient protein. It matches "Protein Deficiency" (2). C. T.B. (Tuberculosis): Caused by the bacterium Mycobacterium tuberculosis. It matches "Bacterial Infection" (3). D. Hepatitis B: Caused by the Hepatitis B virus (HBV). It matches "Viral Infection" (4).