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The correct answer is B
Despite of all the importance attached to water, there has been no effective mechanism adopted to prevent its pollution.
...1) The story is that
2) more than 150 years
3) before, an ill-fated ship sank
4) with all its passengers on board.
5) No error
You should avoid (A)/to look into these matters as (B)/they are complicated and could be (C)/handled only by a professional (D).
The list of the candidates to be called for the interview were put up on the board.