Concept:The verb "ensure" does not require a preposition like "for" after it.
Explanation:The error is in part b) of the sentence.
The word "ensures" is a transitive verb and should be directly followed by its object.
Using the preposition "for" after "ensures" is grammatically incorrect.
For example: "The airline takes steps to ensure safety" (not "ensure of safety").
In the given sentence, the phrase "ensures for the health" should be corrected to "ensures the health".
Thus, remove the word "for" from part b) to make the sentence error‑free.
The corrected sentence reads: "Emphasis on equality of life ensures the health and happiness of every individual."
Answer:B (part b contains the error).