Here's the
official explanation provided by the GMAC for this question:
This sentence indicates that voters authorized funding for a diverse array of public projects, of which two examples are provided. The underlined portion of the sentence must clearly identify these two projects as examples demonstrating the range of the authorized projects' diversity. It should distinguish between the two projects using concise, unambiguous, parallel constructions.
Option A: This wording confusingly suggests that the $5.5 million renovation of the state capitol was constructed along with the $1.4 billion water reservoir system, as part of the same project.
Option B: This wording confusingly suggests that the water reservoir system was constructed in exchange for compensation including both $1.4 billion and the $5.5 million renovation of the state capitol.
Option C: Correct. This clearly and concisely identifies the two projects using unambiguous, parallel constructions.
Option D: This absurdly identifies only one project, the construction of the water reservoir system, as the sole example of all the projects' diversity. It also absurdly indicates that the voters themselves personally renovated the state capitol.
Option E: This absurdly identifies the monetary amounts $1.4 billion and $5.5 million as examples of the public projects the voters authorized.
The correct answer is C.
Please note that I'm not the author of this explanation. I'm just posting it here since I believe it can help the community.