Vance is about to give a lecture but is worried that he is too nervous and will make mistakes. the yerkes-dodson law would predict that he will succeed only if his nervousness is at a level.

He will likely succeed if only his nervousness is at the medium level for this will allow Vance to overcome his task as the medium level is set to overcome medium tasks in which he is on right now with lecturing in having to be nervous of doing or having a mistake.

Dna overload will accrue

The answer is constant.