Find the part of the sentence that contains an error:
That certain state governments have invoked archaic laws (1)/ to suppress dissent does not only reflect legal opportunism (2)/ but also undermines the constitutional ethos (3)/ that such provisions were meant to uphold. (4)

Correct option is B

Option (2) contains an error.
Detailed explanation of error: The construction “does not only … but also …” is grammatically faulty in standard usage.
The correct correlative pair is “not only … but also …” (without “does”).
Here, “does” is already the helping verb for “reflect,” so we must place not before only to form the proper correlative structure: “does not only reflect” should be “does not only” → “not only” with correct placement.
Correct sentence: … does not only reflect legal opportunism but also undermines… → more standard: … not only reflects legal opportunism but also undermines…
Grammatical rule used: Correlative Conjunction Rule (Not only… but also…)
· Use not only + verb, followed by but also + verb, maintaining parallel structure.
· Example: This policy not only reduces costs but also improves efficiency.
· Information booster / exception:
· If you use “not only” at the beginning of a clause, inversion occurs: Not only does it reflect… but it also undermines…
· But in your sentence, “not only” is inside the clause, so no inversion is needed.