$A$ healthy individual has $A$ grams of haemoglobin in every $B$ mL of blood. These molecules play a significant role in the transport of $C$ gases.
Choose the correct option for $A$, $B$, and $C$.

• A
  $A- 12-16, B- 100, C- \text{respiratory}$
• B
  $A- 6-8, B- 100, C- \text{respiratory}$
• C
  $A- 7-10, B- 1000, C- \text{respiratory}$
• D
  $A- 16-20, B- 1000, C- \text{respiratory}$