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According to the sampling theorem, what is the minimum sampling frequency to retain all the information if the bandwidth of the signal is 20MHz?

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According to the sampling theorem, what is the minimum sampling frequency to retain all the information if the bandwidth of the signal is 20MHz?

(a) 20MHz

(b) 40MHz

(c) 80MHz

(d) 2MHz

I had been asked this question in an interview for job.

Question is taken from Data Conversion in chapter Digital Communication Techniques of Avionics

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The correct option is (b) 40MHz

For explanation I would say: According to sampling theorem, minimum sampling frequency = 2 x 20MHz = 40MHz.

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