Final answer:
The particle with the greatest terminal velocity in still air is typically the one with the largest mass.
Step-by-step explanation:
The particle with the greatest terminal velocity in still air is typically the one with the largest mass. In this case, the large hailstone (option C) is likely to have the greatest terminal velocity. This is because the hailstone has more mass compared to the other particles, such as a small ice crystal (option B) or a small dust particle (option D). The large water droplet (option A) may also have a high terminal velocity due to its size and mass, but it would generally be lower compared to a large hailstone.