Why did Indians trade/buy knives and kettles from Europeans?

1)KETTLES:     One trade good which immediately replaced the Native bark or clay equivalent is the metal kettle.

(So you can say that Its was a really good trade for clay)

2)KNIVES:     Metal pocket knives had a special importance to Indians and to anyone living on the frontier where a handy tool was needed and The greatest utility for a knife was for skinning animals and cutting meat.

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the answer to your question is,

d. when a child was born.

-mabel < 3