In the following question, sentences are given with a part in bold. The given phrase in the bold may or may not contain an error. The options following can replace the incorrect phrase. The correct phrase that is to be replaced will be your answer. If the sentences are correct then select ‘No improvement required’ as your answer.

It is essential to neither overstress nor underestimate the significant of the G20’s work.

The correct option to replace the bold phrase is nor underestimate the significance.

Step-by-Step Explanation:

1. Correlative Conjunction Pair:
The sentence uses the correlative conjunction "neither". In English grammar, "neither" must always be paired with "nor" (not "or"). Therefore, "neither overstress nor..." is the correct structure.

2. Parallel Structure:
Both actions following the correlative conjunctions must follow a parallel structure. Since "overstress" is in the base form of the verb following "to" (infinitive: to overstress), the verb following "nor" must also be in the base form (underestimate, not underestimates).

3. Noun vs. Adjective Usage:
The word "significant" is an adjective, whereas the sentence requires a noun to act as the object of the verb "underestimate". The noun form of "significant" is "significance". Thus, it should be "the significance of the G20's work".

Combining these corrections gives the phrase: "nor underestimate the significance".

Corrected Sentence:
"It is essential to neither overstress nor underestimate the significance of the G20’s work."