Read the following excerpt of a text about the importance of water for humans.
"However, failing to drink enough water can cause dehydration and adverse symptoms, including fatigue, headache, weakened immunity, and dry skin".
Based on the excerpt above, which of the following alternatives best fit as its preceding part in a full text?
a) Dehydration means your body loses more fluids than you take in. If it's not treated, it can get worse and become a serious problem.
b) Water pollution is the release of substances into bodies of water that makes unsafe for human use and disrupts aquatic ecosystems.
c) Water also contributes to regular bowel function, optimal muscle performance, and clear, youthful-looking skin.
d) Earth´s water is almost everywhere: above the Earth in the air and clouds, on the surface of the Earth in rivers, oceans, ice, plants, in living organisms, and inside the Earth in the top few miles of the ground.
