The sum of all natural numbers from 75 to 97 is -

Answer: Option D

The sum of all natural numbers upto 97 - sum of all natural numbers upto 74
sum of n natural numbers
$$\begin{array}{rl}& =\frac{n\left(n+1\right)}{2}\left(\text{Formula}\right)\\ & =\frac{97\times 98}{2}-\frac{74\times 75}{2}\\ & =4753-2775\\ & =1978\end{array}$$