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How is the power ratio corresponding to 12dB change in level?

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How is the power ratio corresponding to 12dB change in level?

(a) 16.38

(b) 14.24

(c) 15.85

(d) 12.88

I had been asked this question during a job interview.

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

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Right option is (c) 15.85

To elaborate: To calculate the power ratio corresponding to 12dB change in level:

G = 10^(12 / 10) × 1 = 10^1.2 = 15.85.

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