The Cloud Structure in the Atmosphere of Venus Can Be

The cloud structure in the atmosphere of Venus can be described as

A) a clear layer at the surface, a haze layer above it, a thick layer of permanent clouds, and then more haze.
B) a permanent and thick cloud layer, extending almost to ground level.
C) isolated clouds forming and dissipating all the time, with clear sky between them.
D) mostly clear sky with occasional thin, high clouds and dust.