Final answer:
Water isn't very effective against Rock (C), as it cannot quickly alter its form. However, water can extinguish fire, ruin paper, and has no direct impact on scissors.
Step-by-step explanation:
The student's question asks about the effectiveness of water against various items, and the answer is an example of a simple application of scientific principles related to the classic game "Rock, Paper, Scissors." In the context of this game or in a symbolic sense referring to the elements, water isn't very effective against Rock (C), as it does not alter it immediately in a significant way. However, the concept can stretch to real-world interactions between elements, where water could eventually wear down rock over a long period of time through processes like erosion. Water is, on the other hand, effective at extinguishing Fire (A), it would readily damage Paper (B) by causing it to disintegrate, and would have no direct effect on Scissors (D), similar to rock.