Correct option is D
The error is in part (d), “Meera is the elder.”
Explanation: The term “elder” is incorrect in this context. When comparing only two people, “elder” is appropriate; however, since three sisters are being referenced here, “eldest” should be used to indicate the eldest sibling among the three.
Grammatical Rule Used:
When comparing among more than two people, the superlative form (“eldest” in this case) should be used rather than the comparative form (“elder”).
“Elder” is correct when comparing two individuals, but “eldest” should be used when referring to the oldest of more than two people in a group.
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Corrected Sentence: “I have three sisters: Meera is the eldest and Charu is the youngest.”
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Example of the Rule: Among all her friends, Sarah is the
smartest (superlative used for more than two people), but between Sarah and Jane, Sarah is
smarter (comparative for two people).