Answer:
The answer is B.
Explanation:
So we have this graph. Now let's review all of the possible answers.
For A, This may be the answer, But it is kind of obvious. We need somethign that gives more information.
For C, We know that X is not limited because the lin end in an arrow, which mean it will keep going.
For D, We also know Y is not limited because of the arrow.
B is different then the others. It says that Y is not limited (correct!), And also states that Y never went under 250,000. This gives more information than X is equal or greater then zero.