Which is a unique feature of Venus?

A.
The thick atmosphere—made mostly of carbon dioxide—absorbs solar radiation, heating up and helping make the atmosphere very hot.

B.
It is the smallest planet and has the shortest period of revolution around the sun.

C.
The planet’s surface is covered with red, iron-oxide dust.

D.
It is the only planet with permanent liquid water on its surface.

Question

Which is a unique feature of Venus?	
 
 A.
The thick atmosphere—made mostly of carbon dioxide—absorbs solar radiation, heating up and helping make the atmosphere very hot.
 
 B.
It is the smallest planet and has the shortest period of revolution around the sun.
 
 C.
The planet’s surface is covered with red, iron-oxide dust.
 
 D.
It is the only planet with permanent liquid water on its surface.