Pluto has a diameter of approximately 2,376 km, while Earth's diameter is about 12,742 km. By volume, approximately 500 Plutos would fit inside one Earth (Earth's volume is roughly 500 times greater than Pluto's). This makes option C (500) the correct answer. Options A (200), B (300), and D (457) don't match the actual volume ratio between Earth and Pluto.