Which expression is a perfect cube?

Only is a perfect cube.

Step-by-step explanation:

is not a perfect cube because 8 is not a multiple of 3.

Now, is a perfect cube since 24 is a multiple of 3.  

So, can be expressed as  

Again, is not a perfect cube as 28 is not a multiple of 3.

And also is not a perfect cube as 64 is not a multiple of 3.  

Therefore, only is a perfect cube. (Answer)

Option B.

Step-by-step explanation:

We need to find the expression that is a perfect cube.

First expression is . The degree of x is 8 which is not divisible by 3. So, is not a perfect cube.

Second expression is . The degree of y is 24 which is divisible by 3.

So, is a perfect cube.

Third expression is . The degree of m is 28 which is not divisible by 3. So, is not a perfect cube.

Fourth expression is . The degree of s is 64 which is not divisible by 3. So, is not a perfect cube.

Therefore, the correct option is B.