Easy

LaTex: $\large 6^3 = 216\ and\ 216 ÷ 8 = 27,Hence\ No\ remainder$

Since $6$ is even, then $6 ^ { 3 }$ must be also even.

Then $\text { even } \mod \text { even }$ is always even.

Only zero is even of the choices, so the answer is $\boxed { \text { ZERO!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! } }$

6^3=2^3*3^3 . 8=2^3 . 6^3/8 =3^3 .

6^/8=(6^3)/(2^3)= (6/2)^3= 6%2=0

6x6x6 = 216

216/8 = 27

Hence remainder = 0