Why is earth often referred to as the blue planet?

A.
The hydrosphere looks blue and covers three-fourths of the earth’s surface.

B.
Most people like blue.

C.
The sky is blue.

D.
When viewed from space, the biosphere always looks blue.

Question

Why is earth often referred to as the blue planet?	
 
 A.
The hydrosphere looks blue and covers three-fourths of the earth’s surface.
 
 B.
Most people like blue.
 
 C.
The sky is blue.
 
 D.
When viewed from space, the biosphere always looks blue.

anonymous · Answer

B is subjective
C refers to the sky while on the planet, you can't see the sky in space due to clouds and the reference point
D the biosphere is the Earth itself, and is not all blue

So A

anonymous · Answer

ty u so much