A group of citizens opposes developing a nearby abandoned railroad grade ... ...

A group of citizens opposes developing a nearby abandoned railroad grade into a hiking trail. Its members argue that trail users will likely litter the area with food wrappers and other debris. But this objection is groundless. Most trail users will be dedicated hikers who have great concern for the environment. Consequently, development of the trail should proceed. The argument above is flawed in that it
(A) bases its conclusion mainly on a claim that an opposing argument is weak
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in PT72 (Jun 2014): Logical Reasoning B