Directions: In the following question, one part of the sentence may have an error. Find out which part of the sentence has an error and click the button corresponding to it. If the sentence is free from error, click the ''No error'' option.

The establishment of tribunals as adjudicatory bodies(A)/ in specific fields are based on the idea(B)/ that specialization and expertise are(C)/ required to decide complex cases of a technical nature. (D)/ No error/(E)