Suggest why people once washed their hands with ashes.
A. The oils on the skin act as a base and reacts with the ashes to produce soap.
B. After being burnt in the fire, the acids and bases of the log are neutralized, making it a gentle material to use on the hands.
C. The ashes act as an acid and reacts with the skin oils to produce soap.
D. The ashes act as a base and reacts with skin oils to produce solutions of soap.
Answer: D
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