The equation \( \frac{2}{3} x + 13 = 29 \) can be best modeled by the statement:
Luis needs to bring 29 oranges to a party. He has \( \frac{2}{3} \) of the oranges he needs, and his brother will get another 13 oranges. How many oranges does Luis have?
This is because the equation reflects the situation where \( \frac{2}{3} x \) represents the portion of oranges Luis currently has, and the additional 13 oranges from his brother, together totaling 29. So, the best option that fits the equation is the one about Luis and the oranges.