If Venus Once Had an Ocean, Where Did It Go

If Venus once had an ocean, where did it go?

A) It exists as abundant water vapor in the planet's atmosphere.
B) It was lost to space, stripped away by the solar wind.
C) The water broke into hydrogen, which escaped to space, and oxygen, which became trappedin the planet's surface rocks.
D) It exists trapped in the crust but below the surface.
E) It is found in the cooler polar regions, like at the Moon and Mercury.