Sunland Highway Patrol Commissioner: The majority of calls

Fact: The majority of calls made from the blue call boxes on the side of the highway are made to report non-emergencies.
Fact: Since virtually all drivers on Sunland Highways have cell phones now, the call boxes are not helping motorists.
Conclusion: the SHP should to deactivate and remove the boxes. Doing so will decrease redundant calls to the SHP without hampering peoples’ ability to report highway emergencies.

Assumption: To help motorists, SHP should be able to receive and trace where a call made from cell phone is as correctly as SHP is able to do with a call made from a physical place (a call box).

Which of the following, if true, most strongly supports the claim that the removal of the boxes, if carried out, will have the announced effect?

A) At any given time half of the drivers on Sunland Highways are talking on their cell phones.
Wrong. "more time talking on cell phones" is too far --> Out of scope.

B) Currently, nearly one third of the blue call boxes are out of order. .
Wrong. Out of scope. The argument mentions nothing about the number of call boxes that are out of order.

C) The SHP is able to trace calls made from cell phones and record the location of the caller.
Correct. Because SHP can trace the "location" of the call from cell phone as correctly as that from a call box. Thus, SHP can help motorists. SHP does not need call boxes anymore if anybody uses cell phone to report accidents.

D) The SHP pays $10 million annually on phone service for the call boxes.
Wrong. Out of scope. Nothing about the cost. The argument just talk about the ability to receive a call from a cell phone vs. from a call box.

E) A motorist on passing by a cell phone is able to give more information about a highway emergency than one on the side of the road.
Wrong. More information does not mean SHP's alway able to locate exactly where the accident is. E is too far and is incorrect.

Hope it helps.