I prefer The Hindu. (a)/ but my eldest (b)/ son reads (c)/ Times of India (d).
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Remember: "Elder"/"Eldest" is used for people, not things. "Eldest" is specific to family members (oldest child). Use "elder" before nouns (elder brother, elder son).
Step 1: Identify the meaning. The sentence is about preference of a newspaper. The word "eldest" is used for the "oldest among brothers/sisters," not for "children" in general.
Step 2: Correct usage. In standard English, the correct word is "elder" when referring to sons/daughters. "Eldest" is only for the oldest among more than two siblings.
Step 3: Rewrite. The correct sentence should be:
"I prefer The Hindu, but my elder son reads The Times of India."
\[
\boxed{\text{Wrong word: eldest}}
\]