Task: Question Answering
Input (English): Which of the following expressions must be negative if \(x < 0\)?
(A)\(x^4 + x^2 + 4\) (B)\(x^5 -1\) (C)\(x^6 - 1\) (D)\(x^6 + x^2 + 1\) (E)\(x^2 + 10\)
Output (English): B