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The concentration level of lead in blood is about 25 μg/100 ml. So any value above this is considered alarming.

1. Methyl isocyanate is a colourless highly flammable liquid that evaporates quickly when exposed to the air. It has a sharp, strong odour. This is used in the production of pesticides, polyurethane foam, and plastics.
2. Exhaustible resources are those natural resources that are likely to be exhausted due to their continuous use. Forest is a renewable exhaustible resource that can be produced again and again. Coal, petroleum and minerals are non-renewable exhaustible natural resources that cannot be produced again.
3. Extensive use of chemical fertilizers may lead to eutrophication of nearby water bodies.
4. The concentration level of lead in blood is about 25 μg/100 ml. So any value above this is considered alarming.

Correct answer: The concentration level of lead in blood is about 25 μg/100 ml. So any value above this is considered alarming.

Solution

Option D directly states the fact mentioned in the question, making it the correct answer. The other options are unrelated to the concentration of lead in blood.

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