What is the signal-to-noise ratio (SNR) (dB) at the receiver input?

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The signal at the input to a balanced twisted pair cable is 10 mW. The cable is 1000 feet long and has an attenuation of 1 dB per 100 feet. This cable is connected to the input of a receiver. The noise level at the input to the receiver is 1 microwatt.

What is the signal-to-noise ratio (SNR) (dB) at the receiver input?
A . 10 dB
B . 30 dB
C . 40 dB
D . 60 dB
E . 100 dB

Answer: B