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A.

-256

B.

-512

C.

256

D.

512

Correct option is B

Given:
​x8+8x=1\frac{x}{8} + \frac{8}{x} = 1   
Concept Used:  ​
​if       x+1x=1       then,x3=−1\text{if} \ \ \ \ \ \ \ x + \frac{1}{x} = 1 \ \ \ \ \ \ \ then,\\ x^3 = -1​​
Solution:  ​
​

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