The following sentence has been divided into parts. One of them may contain an error. Select the part that contains the error from the given options. If you don’t find any error, mark ‘No error’ as your answer.
Group discussion and pair work are / good classroom strategies encourage / students to speak out their ideas.
The phrase "good classroom strategies encourage" should be "good classroom strategies that encourage" or "good classroom strategies to encourage"
Hence, this part of the sentence is incorrect and therefore, Option D is the correct answer.