The square root of integer \(x\) is equal to the sum of the cubes of \(y\) and \(z.\) If the squares of \(y\) and \(z\) are each less than \(10,\) what is the greatest possible value of \(x?\)

A. 2916
B. 3981
C. 3982
D. 3999
E. 4000

Answer: D

Source: Magoosh