Waste materials are like radioactive, poisonous and etc. But since the word safe means its free to touch with your skin that doesn't make you sick so A is the answer B means dangerous and can damage the skin most likely since the word harmful is dangerous.
C. Waste materials are the same as B but more dangerous
Answers & Comments
Answer:
A
Explanation:
Waste materials are like radioactive, poisonous and etc. But since the word safe means its free to touch with your skin that doesn't make you sick so A is the answer B means dangerous and can damage the skin most likely since the word harmful is dangerous.
C. Waste materials are the same as B but more dangerous
D. Is the absolute opposite of the question.