Final answer:
The correct statement about the amount of juice is j = 250 ml.
Step-by-step explanation:
In this question, we are given that a carton contains 250 ml of juice, correct to the nearest milliliter. We need to complete the statement about the amount of juice, j ml, in the carton. Since the carton contains exactly 250 ml of juice, the correct statement is: j = 250 ml (option A).