People who listen to certain recordings of music are in danger of being unduly influenced by spoken messages that have been recorded backwards on the records or tapes.
A consequence of the view above is that
(A) the spoken messages must be louder than the music on the recordings
(B) backwards messages can be added to a recording while still preserving all of the musical qualities of the recorded performance
(C) the recordings on which such messages appear are chosen for this purpose either because they are especially popular or because they introduce a trancelike state
(D) if such messages must be comprehended to exert influence, then people must be able to comprehend spoken messages recorded backwards
(E) when people listen to recorded music, they pay full attention to the music as it plays
Please explain how to approach these kind of questions!