Okay, so your reasoning is pretty solid, but you will really want to keep in mind of how they're using the move, especially with such a tricky technique which often has multiple ways to use it. Note how I've said I'm using
blasts of water, so I'm using them as small projectiles and not as waves like you seem to have interpreted.
In this situation, the best thing to use to counter the projectile base of the technique is by using a projectile itself, especially considering that we're dealing with water. That being said, Thunder Burn or Lightning Technique would be the best example to use as they are also projectiles, and would easily counter the water. Now while your choice isn't the worst technique to use, our RP has a rule where you have to defend a jutsu with a jutsu of your own so in a sense, it's best to assume their technique will hit you regardless of your movement. Your choice I imagine would be ducking underneath the water and then shocking them, which would be good, but you need to take into account the range of the technique.
That being said, I would say the worst technique to use in this situation would be Raging Thunder. The simple idea being that this is a Water technique, and this technique has to come from you since you're creating a field shield around you with your hand, so it traces back and electrocutes you, and we don't want that now.
I'd like to play around with you a little more, but I can confidently say you're done with D-Ranks. If you don't have questions, we'll move onto C-Rank Lightning jutsu. :3