IMO D.
Only D articulates proper tenses.
Here the agreement is in 1972 hence active verb 'reduce' should be in past tense. 'Reduced' is correct.
The use of past perfect continuous is incorrect because 'dumping' continues in the present. hence 'are' is the correct usage
Only D articulates proper tenses.
Here the agreement is in 1972 hence active verb 'reduce' should be in past tense. 'Reduced' is correct.
The use of past perfect continuous is incorrect because 'dumping' continues in the present. hence 'are' is the correct usage
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