In each of the following questions, a sentence with four highlighted words has been given. One of these highlighted words may or may not have been used unnecessarily in the given sentences. You are required to choose the word that is redundant and gives a superfluous meaning. If all of the highlighted words are essential for the contextual meaning of the sentence, then choose option (e) as your answer choice.

Regional hospitals (A) at the secondary level within the government sector are essential (B) in urban facilities to ensure (C) the needs of the population during critical (D) situations.

The correct answer is None of these (Option E).

To determine if any of the highlighted words are redundant or superfluous, let us analyze the context and meaning of the sentence:
"Regional hospitals (A) at the secondary level within the government sector are essential (B) in urban facilities to ensure (C) the needs of the population during critical (D) situations."

Let's evaluate each highlighted word:
1. hospitals (A): This is the subject of the sentence, specifying the type of healthcare institutions being discussed (regional hospitals at the secondary level). It is contextually necessary.
2. essential (B): This adjective describes the importance of these hospitals, indicating that they are absolutely necessary or indispensable. It is contextually necessary.
3. ensure (C): This verb connects the existence of these hospitals to meeting the needs of the population. It means to make sure, guarantee, or secure, which fits grammatically and contextually.
4. critical (D): This adjective modifies "situations," highlighting that these are times of crisis, emergency, or high importance when hospital services are most needed. It is contextually necessary.

Since all of the highlighted words are grammatically correct, semantically appropriate, and essential to convey the intended meaning of the sentence without introducing redundancy, none of them are superfluous. Therefore, the correct choice is "None of these".