With mathmetics. the best answer with showed work gets brainliest. the question is in the inserted photo.

Vcylinder=hpir^2
Vcone=1/3hpir^2

vcone
h=6
r=3/2=1.5
v=1/3*pi*6*1.5^2
V=2pi*2.25
V=4.5pi

vcylinder
r=3/2=1.5
h=5
v=5*pi*1.5^2
v=5pi*2.25
v=11.25pi

minus

A-B=4.5pi-11.25pi=6.75pi

aprox pi=3.141592
diference is21.205
round

21.2
answer is 2nd option

Solutions 

Volume is the measure of the amount of space inside of a solid figure. To solve the question we have to use the formula's for a cone and cylinder. 

Volume of cylinder =hπ²
Volume of cone =1/3hπ² 

Solve 

Volume of cone 
Formula = 1/3hπ²  

height = 6
r = 3/2=1.5
v=1/3×π×6×1.5^2
V=2π×2.25
V=4.5pi

Volume of cylinder
formula =hπ²

r=3/2=1.5
h=5
v=5×π×1.5²
v=5π×2.25
v=11.25π

Subtraction 

A-B=4.5π -11.25π=6.75π

π =3.141592

= 21.205

rounded = 21.2

2nd option

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