Ocean trenches are the deepest parts of the ocean. Deep ocean trenches are associated with Constantly Moving a certain type of volcanic chain called an island arc and with zones of high earthquake activity.
In the following question, some part of the sentence may have errors. Find out which part of the sentence has an error and select the appropriate option. If a sentence is free from error, select 'No error'. The reason for (1)/ his failure is because (2)/ he didn't study at all. (3)/ No Error (4)