What is the correct temperature range for storing whole blood and red blood cells?

The question asks for the correct temperature range for storing whole blood and red blood cells.

According to standard blood banking guidelines, whole blood and red blood cell concentrates must be stored at a temperature range of $2^\circ\text{C}$ to $6^\circ\text{C}$. This temperature range is critical for maintaining the viability and function of the red blood cells and for minimizing bacterial growth.

Let's evaluate the given options:

• Lower limit 5 - Upper limit 10 ($5^\circ\text{C}$ to $10^\circ\text{C}$) - This range is too high.
• Lower limit 2 - Upper limit 6 ($2^\circ\text{C}$ to $6^\circ\text{C}$) - This is the correct and widely accepted storage temperature range.
• Lower limit 3 - Upper limit 5 ($3^\circ\text{C}$ to $5^\circ\text{C}$) - While this range falls within the acceptable $2^\circ\text{C}$ to $6^\circ\text{C}$ range, the $2^\circ\text{C}$ to $6^\circ\text{C}$ option represents the full standard range.

Therefore, the correct option is "Lower limit 2 - Upper limit 6".

The final answer is $\text{Lower limit 2 - Upper limit 6}$