The difference between Marasmus and Kwashiorkor is that:

• A
  Marasmus is caused by deficiency of vitamin $B$ while Kwashiorkor is caused by the deficiency of vitamin $D$.
• B
  Marasmus is caused by a calorie deficiency while Kwashiorkor is caused by protein deficiency.
• C
  Marasmus is simultaneous deficiency of proteins and calories while Kwashiorkor is due to just protein deficiency unaccompanied by calorie deficiency.
• D
  Marasmus is deficiency of just proteins while Kwashiorkor due to a deficiency of both proteins and calories.