Find the part of the sentence that contains an error: The fact that citizens have no remedy available (1)/ when environmental breaches are ignored at the ministerial level (2)/ highlight a broader decline in (3)/ constitutional accountability. (4)

The correct option is (3).

Explanation:

Let's analyze the subject-verb agreement in the given sentence:

"The fact that citizens have no remedy available (1)/ when environmental breaches are ignored at the ministerial level (2)/ highlight a broader decline in (3)/ constitutional accountability. (4)"

1. The main subject of the sentence is "The fact", which is a singular noun phrase.
2. The clause "that citizens have no remedy available when environmental breaches are ignored at the ministerial level" acts as a subordinate clause modifying "The fact".
3. Since the subject "The fact" is singular, it requires a singular verb.
4. In part (3), the verb used is "highlight", which is plural. The correct singular verb form should be "highlights".

Therefore, the error lies in part (3) of the sentence.

Corrected 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."