As an evil villain bent on taking over the world, you need a brand new island that no one knows about to install your giant death ray. Which of the following processes likely created your new island? A) flood B) landslide C) glacial movement D) volcanic eruption

It would be a volcanic eruption. An underground volcano would erupt lava, magma, etc. The water would quickly harden the magma, which would turn into rock.

Process of elimination:

you can't flood in the ocean. ever.

there isn't any land above the ocean in the middle of water. doh.

glaciers? pfft, they're only north/south nowadays ... glaciers moving doesn't make sense, they melt into water

D) volcanic eruption.