The question asks to write the arithmetic series given in sigma notation, and the series is:

$8 + 16 + 24 + 32 + \ldots + 75$

Now, let's find the correct sigma notation representation. The series is arithmetic with the following characteristics:

1. First term $a = 8$
2. Common difference $d = 8$
3. The last term is $75$

The general form of an arithmetic sequence is:

$a_n = a + (n - 1) \cdot d$

To find the total number of terms $n$, use the equation for the $n$-th term:

$75 = 8 + (n - 1) \cdot 8$

Solving for $n$: