A teacher has provided his students with effective instructional delivery for a reading lesson in cause and effect. How can he determine that his students are able to complete a task on the concept independently and apply what has been learned:

The correct answer to this open question is the following.

Although the question does not include references for the lessons learned, we can comment on the following.

A teacher can determine that his students are able to complete a task on the concept independently when the students have demonstrated in class the commitment to correctly finish different tasks on the subject. This means that the teacher has closely followed the performance of the students by monitoring them through quizzes, exercises, and permanent feedback in class.

Teachers have to implement different techniques so students can practice until they feel they are capable to work independently and prove they are reading and comprehending the lectures. It is always recommended that the teacher stills preparing a series of questions with each reading exercise, in order for the student to prove its progress.  

b) to encourage free trade

it is a better alternative