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(C) The sequence of the first $n$ natural numbers is $1, 2, 3, \dots, n$.This is an Arithmetic Progression $(AP)$ where the first term $a = 1$ and the

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$\frac{n(n+1)}{2}$

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(C) The sequence of the first $n$ natural numbers is $1, 2, 3, \dots, n$.This is an Arithmetic Progression $(AP)$ where the first term $a = 1$ and the common difference $d = 1$.The sum of the first $n$ terms of an $AP$ is given by the formula $S_n = \frac{n}{2}[2a + (n-1)d]$.Substituting the values $a = 1$ and $d = 1$ into the formula:$S_n = \frac{n}{2}[2(1) + (n-1)(1)]$$S_n = \frac{n}{2}[2 + n - 1]$$S_n = \frac{n(n+1)}{2}$.Thus, the sum of the first $n$ natural numbers is $\frac{n(n+1)}{2}$.

The sum of the first $n$ natural numbers is:

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