The correct option is B Marasmus
Marasmus is a condition that affects newborns and young children and is caused by a severe protein and calorie shortage. It generally results in weight loss and dehydration. Due to a lack of necessary nutrients, marasmus can progress to famine and death.
Hypocalcaemia is caused by lack of vitamin D.
Pellagra results from severe vitamin B3 (Niacin) deficiency.
Osteomalacia is softening of bones, most often caused by severe vitamin D deficiency.