Option(A) is correct
Option A : Correct. Unless the answer to this question were yesrather than no, the switch to LED arrays would not help minimize Traverton's yearly maintenance costs. So it is essential to know the answer to this question in order to determine whether switchingto LEDs would help.
Option B : The existence of another possible alternative to incandescent lights does not have any bearing on the question of whether switching from incandescent lights to LEDs would help.
Option C : Thesource from which Traverton acquires its lights, be theyincandescent or LEDs, is unimportant.
Option D : Increasing the numberof traffic signallightsin Travertonwouldprobably increase the city's yearly maintenance costs, but it woulddo so regardless of whether those lights use LEDs or incandescent bulbs.
Option E : Since the goal of switchingto LED arrays is to help minimizeyearly expenditures on maintenance, a potential one-time cost—that of trainingworkers to convert the existing fixtures—is not relevant. Further, it is not necessarily thecase that thecrews that currently replace the incandescent bulbs would be the ones converting the existing fixtures-and even if they were, the accountof the plan statesthat conversion costs would be minimal.
The correct answer is A.