The function that describes the difference of the number of components assembled per day by the experienced and new employees is:
E(t) - N(t)
This is because E(t) represents the number of components assembled by an experienced employee in t hours, and N(t) represents the number of components assembled by a new employee in t hours. Therefore, the difference between the two functions will give us the difference in the number of components assembled per day by the two types of employees.
Out of the given options, option A represents the correct answer:
E(t) - N(t) = (5t) - (3t) = 2t
Therefore, the correct answer is A.