According to the formula,

The average of 1 to n odd numbers =$\frac{\mathrm{Last} \mathrm{odd} \mathrm{number}+1}{2}$

Here, The last odd number= 45

∴ Average of 1 to 45 odd numbers =$\frac{45+1}{2}=\frac{46}{2}=23$

Again, According to the formula,

The average of 1 to n even numbers=$\frac{\mathrm{Last} \mathrm{even} \mathrm{number}+2}{2}$

Here, Last even number = 44

∴ Average of 1 to 44 even numbers =$\frac{44+2}{2}=\frac{46}{2}=23$

Hence, Option E is correct.