Find the part of the sentence that contains an error:
The regulator's decision to postpone the implementation (1)/ was attributed partly to industry pressure (2)/ and partly due to legal ambiguity (3)/ surrounding the recent amendments. (4)

Correct option is C

Option (3) contains an error.
Detailed explanation of error: The sentence uses “was attributed partly to…” which requires parallel structure: the second part should also follow “to”. But it says “and partly due to”, mixing two different structures:
· “attributed to”
· “due to” (but it needs a different main verb like “was due to”)
· So, the correct parallel form should be: “was attributed partly to industry pressure and partly to legal ambiguity…” OR rewrite as “was due partly to… and partly to…”
· Grammatical rule used: Parallelism + correct verb–preposition pairing
· attribute (something) to (something)
· be due to (something)
· Example (rule used):
· Correct: The delay was attributed to technical issues and to staff shortages.
· Incorrect: The delay was attributed to technical issues and due to staff shortages.
· Information booster / exception:
· Competitive exams often test confusion between “attributed to” and “due to.” Keep the structure consistent across joined phrases (and/or).