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SajjadAhmad
It is widely accepted by scientists that chlorofluorocarbons released into the atmosphere as a result of industrial refrigeration and insulation is the main cause of the huge gaps in the earth’s ozone layer.

(A) released into the atmosphere as a result of industrial refrigeration and insulation is
(B) released into the atmosphere as a result of industrial refrigeration and insulation are
(C) resulting from industrial refrigeration and insulation released into the atmosphere are
(D) being released into the atmosphere as a result of industrial refrigeration and insulation is
(E) having been released into the atmosphere and resulting from industrial refrigeration and insulation are

Master GMAT
It is widely accepted by scientists that chlorofluorocarbons released into the atmosphere as a result of industrial refrigeration and insulation are the main cause of the huge gaps in the earth’s ozone layer.

Correct answer must be (B) for correct subject - Verb agreement, errors in other options highlighted in red...
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