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What is the corresponding change in level for a factor of 10 change in amplitude?

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What is the corresponding change in level for a factor of 10 change in amplitude?

(a) 100dB

(b) 20dB

(c) 10dB

(d) 0.1dB

I got this question in exam.

My query is from The Decibel in division Low Frequency Transistor Amplifier Circuit of Electronic Devices & Circuits

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The correct option is (b) 20dB

The explanation is: A decibel is ten times the value of power in its logarithm in base 10. Therefore a 20dB change is resultant of a change in amplitude by a factor of 10. However, when calculating in terms of power the change is due to a factor on 10.

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