As water is cooled from 4° C to 0° C, its density A. stays the same
B. decreases and increases
C. increases
D. decreases

I believe that it increases (becoming more dense)

Explanation:

Well 0°C is freezing point so I think that in that state it will become a solid from a liquid and freeze into ice.

I hope this will help

Explanation:

When you drink too much water, your kidneys can't get rid of the excess water. The sodium content of your blood becomes diluted. This is called hyponatremia and it can be life-threatening.

Hyponatremia is a low sodium concentration in the blood. It is generally defined as a sodium concentration of less than 135 mmol/L (135 mEq/L), with severe hyponatremia being below 120 mEq/L. Symptoms can be absent, mild or severe. Mild symptoms include a decreased ability to think, headaches, nausea, and poor balance.