Respiration can be defined as

• A
  $A$ catabolic process by which animal cells utilise carbon dioxide,produce oxygen and convert the released energy to $ATP$
• B
  $A$ catabolic process by which animal cells utilise oxygen,produce carbon dioxide and convert the released energy to $ATP$
• C
  An anabolic process by which animal cells utilise oxygen and carbon dioxide to form $ATP$
• D
  An anabolic process by which animal cells utilise oxygen,produce carbon dioxide and convert the released energy to $ATP$