In the following question, a sentence is given with a part in bold. The given phrase in bold may 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 sentence is correct as it is, then select ‘No improvement required’ as the answer.

It was evident that the team needed to refined it’s strategy for the better in order to overcome the challenges ahead.

The correct option is refine its strategy to be better.

Let's analyze the grammatical correctness of the given sentence:

"It was evident that the team needed to refined it’s strategy for the better in order to overcome the challenges ahead."

There are three main errors in the highlighted portion of the sentence:

1. Infinitive Verb Rule: The word "needed" is followed by the infinitive particle "to". In English, "to" is followed by the base/root form of a verb (infinitive), not the past tense. Therefore, "to refined" is incorrect and must be changed to "to refine".

2. Possessive vs. Contraction ("its" vs. "it's"): "It's" is a contraction of "it is" or "it has". "Its" is a possessive pronoun showing ownership. Here, the strategy belongs to the team (a collective singular noun), so the possessive pronoun its should be used instead of it's.

3. Phrasing/Prepositional structure: The phrase "for the better" means "to result in a better situation", but in this context, the infinitival purpose clause "to be better" or "to improve" fits naturally to modify how the strategy should be made/transformed.

Evaluating the options:

- refine its strategy of better: Incorrect usage of the preposition "of".

- refined their strategies to better: Keeps the incorrect past tense verb "refined".

- No replacement required: Incorrect because the original sentence contains grammatical errors.

- refine its strategy to be better: Correct! Uses the base verb "refine", the possessive pronoun "its", and the grammatically appropriate phrase "to be better".

- refine their strategies for better: Incorrect phrasing "for better" without an article or proper structure, and changes singular pronoun "its" unnecessarily.

Therefore, replacing the phrase gives the correct sentence:

"It was evident that the team needed to refine its strategy to be better in order to overcome the challenges ahead."