• The sentence contains an error in part (3).
• The phrase "highlight a broader decline in" is grammatically incorrect because the subject of the sentence is singular.
• The subject "The fact" requires a singular verb.
• Therefore, the correct form should be "highlights a broader decline in" to maintain proper subject-verb agreement.
• This correction makes the sentence grammatically accurate and improves clarity.

Therefore, the correct answer is Option 3.

Correct Sentence:

"The fact that citizens have no remedy available when environmental breaches are ignored at the ministerial level highlights a broader decline in constitutional accountability."

Additional Information

• Part 1: "The fact that citizens have no remedy available" — This part is grammatically correct and does not require any change.
• Part 2: "when environmental breaches are ignored at the ministerial level" — This part is also correct in structure and usage.
• Part 4: "constitutional accountability" — This phrase is grammatically correct and appropriately used in the sentence.