An instructor is teaching a group of learners who are about evenly divided: half understand the lesson well and half are having great difficulty. Which of the following is the course of action the instructor should take under these circumstances?

A.
Provide challenging exercises for the quick learners and spend additional time working with slower learners during small group sessions.

B.
Teach to the lowest common denominator to motivate slow learners and inform the faster learners that they already understand the material.

C.
Teach the course as it is written because that material is what the customer approved and expects to be taught.

D.
Suggest that each learner who is having difficulty ask one of the more able learners for help.