The four sentences (labelled $A, B, C, D$) given below, when properly sequenced would yield a coherent paragraph. Decide on the proper sequence of the order of the sentences and key in the sequence of the four numbers as your answer.
B, A, D, C is the right order.
Begin by defining ‘Atonality’ (Option B). To further that, Option A tells us how it might sound to an “uninitiated listener”. The “however” clause follows (Option C). Finally, (Option D) concludes the argument.