Correct answer = B
A) environmental groups are concerned by offshore oil drilling and mineral exploration taking place --> "concerned by" vs "concerned that" = second is better
B) environmental groups are concerned that offshore oil drilling and mineral exploration taking place --> Correct
C) a concern by environmental groups is that the offshore oil drilling and mineral exploring taking place --> "because"...."a concern" = doesn't make sense
...
A) environmental groups are concerned by offshore oil drilling and mineral exploration taking place --> "concerned by" vs "concerned that" = second is better
B) environmental groups are concerned that offshore oil drilling and mineral exploration taking place --> Correct
C) a concern by environmental groups is that the offshore oil drilling and mineral exploring taking place --> "because"...."a concern" = doesn't make sense
...





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