That would be D. Isovolumic contraction 
As the name states during ISOvolumic contraction the volume of the ventricles doesn’t change and stays the same so no blood enters or leaves the ventricles. The thing that changes is the pressure of the ventricles that increases. 
I can explain the process more if u want in the comments:)
        
             
        
        
        
Perception of pitch and sound intensity is the cocklear
        
             
        
        
        
Human forelimbs is used for a variety of functions, such as for eating.
Similarities: They are all made from the same basic anatomical structure classified as homologous structures.
They all have this structure inherited from a common ancestor.
 
        
             
        
        
        
Um..? okay?..
“This Question has been deleted”?