Final answer:
The situation represented by the equation x + 6 = 13 is that Zoltan spent $13 on a shirt and $6 on sunglasses, resulting in a total expenditure of $19.
Step-by-step explanation:
The situation that can be represented by the equation x + 6 = 13 is option D. Zoltan spent $13 on a shirt and $6 on sunglasses. x represents the total amount that Zoltan spent, which is equal to $13 + $6 = $19.