It's B because when you throw something it doesn't go up it slowly descends downward
        
                    
             
        
        
        
Dinosaurs but I need the whole groups yo tell you ;)
        
             
        
        
        
When light passes from one medium to another, part of it continues on 
into the new medium, while the rest of it bounces away from the boundary, 
back into the first medium.
The part of the light that continues on into the new medium is <em>transmitted</em> 
light.  Its forward progress at any point in its journey is <em>transmission</em>.  
Its direction usually changes as it crosses the boundary.  The bending is <em>
refraction</em>.
The part of the light that bounces away from the boundary and heads back 
into the first medium is <em>reflected</em> light.  The process of bouncing is <em>reflection</em>.