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A. Large reductions in the ozone layer, which sits about 15-30 km above the Earth, take place each- winter over the Polar regions, especially the Antarctic, as low temperatures allow the formation of stratospheric clouds that assist chemical reactions breaking down ozone.
B. Industrial chemicals containing chlorine and bromine have been blamed for thinning the layer because they attack the ozone molecules, making them to break apart.
C. Many an offending chemicals have now been banned.
D. It will still take several decades before these substances have disappeared from the atmosphere.
Options:
A .  D only
B .  B & D
C .  A & D
D .  A & C
E .  Neutralize the arguments of Mr. Lindblad and to argue that one needs to go beyond and look at the motives of these regimes.
Answer: Option C
:
C
Option: (C)
Statements B and C are incorrect. Statement B is incorrect because 'to break apart' is an incorrect idiom. It should be "making them break apart”- the verb 'make' is not followed by an infinitive (to+verb).
Statement C is incorrect because of 'many an offending chemicals'. The correct versions will be 'many offending chemicals (have)' or many an offending chemical (has)'. This eliminates options (b) and (d).
Statements A and D are both correct.

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