Concept:The committee plans to build parks for children's physical and mental development. Any statement that shows the park will not actually benefit children will weaken this plan.
Explanation:Evaluate each statement against the purpose of the park.
Statement I: Guardians accompanying children will increase revenue, and the fee is already nominal. This does not oppose the plan.
Statement II: Parks being near schools and a college does not harm children's safety or development. This does not weaken the plan.
Statement III: If eight out of ten rides are made for adults, then the park fails to serve children's development. This directly contradicts the core aim of the plan and therefore weakens it.
Statement IV: Dividing the park into sections with separate charges is consistent with the stated nominal fee structure. This does not weaken the plan.
Statement V: Activities near an electricity station are not necessarily unsafe, as proper precautions can be taken. This does not weaken the plan.
Thus, only Statement III most weakens the committee's plan.
Answer:Only III, i.e., Option C.