NEED HELP ASAP TIMED TEST Which might occur if the kidneys did not function properly?

A. Signals could not be sent to the brain.
B. Fluid levels could not be maintained.
C. Solid waste could not be removed.
D. Nutrients could not be absorbed from food.

I am pretty sure its b

Explanation:

If your kidneys stop working completely, your body fills with extra water and waste products. This condition is called uremia. Your hands or feet may swell. You will feel tired and weak because your body needs clean blood to function properly.

490*x + 700*y > 4000

It is < as it can be equal to 4000 per week or less than.