If radius ( r ) of a sphere is reduced to its half then , new volume would be -

 

a) 1/2 ( 4/3 pi r³)

 

b) 4/3 pi r³ ( r³/ 2 )

 

c ) 4/3 pi r³ ( r³/8 )

 

d ) 4/6 pi ( r³/8 )

Pls answer this question with steps .