Answer:
D
Step-by-step explanation:
The mean or average is calculated by summing each element and then dividing by the number of elements.
We have: 35, 30, 45, 65, 44, and 21.
There are six elements in total.
We find the sum by adding. Hence:

We will now divide by 6, the number of elements:

Therefore, the mean runs scored by the batsman is 40.
Hence, our answer is D.