Water in nature is in contact with the atmosphere, soil, rocks, etc. , so it contains a variety of "impurities", such as calcium, magnesium, potassium, sodium, iron, fluorine, etc. Modern people tend to drink more and more pure water, such as distilled water, Pure water, space water, etc. As everyone knows, long-term drinking of this ultra-pure water will not be good for your health. Which of the following options best supports the above assertion? ['The more people pay attention to food hygiene, the more vulnerable human health will be.', 'Only untreated natural water can meet the needs of human health.', 'The reason why ultrapure water is so popular is that it is more hygienic and tastes better.', 'The so-called "impurities" in natural water may be an important source of essential trace elements in the human body.']