A course took place in a crowded room, with too many people and poor ventilation. Learners were clearly uncomfortable and distracted, and the instructor had a hard time keeping the learners focused. This environmental problem should be reported:

A.
at the end of the course so that future courses are not scheduled in the same environment

B.
at the end of the course so that results of learning are qualified or excused

C.
immediately so that the course can be rescheduled

D.
immediately so that better accommodations can be found