The given sentence has been broken up into four different parts. The error, if any, will be in one or more parts of the sentence. Select the option which contains the part of the sentence which is free from an error. If all are incorrect mark Option 4 as your answer.

As services now accounts for almost 50% of GDP, it is debatable that  the movements in IIP (A) / trends give a true picture of changes in the extend of economic activity, unless one assumes (B) / a perfect correlation between economic activity in the manufacturing and service sectors (C) / and a one-to-one correspondent between the organized and unorganized sectors. (D)