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5. while boiling water in a kettle,Gwayne notice that there are smoke coming from spout of a kettle.He asked his mother, "Why did the smoke rise upward ”?What do you think will be the mother's answer?

a.because the water reached its cooling point

b.because the water reached its boiling point

c.because the water is heated and became water vapor

d.because the water is freezing​