Final answer:
In the given inequality |x| < x², the statement that must be true is that x is negative.
Step-by-step explanation:
In the given question, we are asked to determine which statement must be true if |x| < x². Let's analyze the given inequality.
|x| < x²
This inequality is true when x is negative or zero. It is not true when x is positive or a fraction. Therefore, the correct statement is B. x is negative.