In the context of this question, the distinction between the four holes in a fountain pertains to the potential propulsion of water based on their relative positioning. Here`s a brief explanation for each option:

Option 1-4: The fourth hole, being the lowest one, is under maximum pressure when filled with water due to the effect of gravity. The more the pressure, the farther the water will be thrown, which is why this is the correct answer.

Option 2-3: This implies the third hole will throw the water farthest which is untrue. Although the third hole is under more pressure than the upper two, it faces less pressure than the fourth hole, resulting in the water not being thrown as far.

Option 3-2: The second hole won`t throw the water farthest, as the pressure it experiences is less than both the third and fourth holes.

Option 4-1: The topmost hole, represented by 1, experiences the least pressure among all the holes as the height of the water column above it is least. Therefore, it cannot throw the water farthest.

So, indeed answer 4 (which refers to hole 4) is correct.