To determine the central idea of paragraph 3, consider the context and content presented within that paragraph. Based on the choices provided, the best choice would typically be the one that captures the main point or theme discussed in that paragraph.
If the paragraph discusses the advantages of installing solar panels at the school, highlighting environmental benefits, cost savings on energy, and educational opportunities for students, then:
D. The implied central idea is that there are multiple benefits to installing solar panels at the school.
This choice suggests a holistic view of the advantages of solar panels, aligning with the notion that there are various positive outcomes associated with this action.