Intensity level 200 cm from a source of sound is 80 dB. If there is no loss of acoustic power in air and intensity of threshold hearing is \[{{10}^{-12}}W{{m}^{-2}}\] then, what is the intensity level at a distance of 400 cm from source

• A.            Zero                                         
• B.            54 dB
• C.            64 dB                                       
• D.            44 dB