Based on the format of the information provided, it seems that the diagram shows 6 identical quantities of \(a + 5\) that sum up to 129. Therefore, the correct equation that corresponds to this situation is:
\(129 = 6(a + 5)\)
So the correct multiple choice answer is:
129 equals 6 left parenthesis a plus 5 right parenthesis (129 = 6(a + 5))