Correct option is B
Option (b) contains an error.
Explanation: The correct phrase is “
a cold day,” not “the cold day,” because the reference is
general, not specific.
Correct sentence: It’s going to be
a cold day today.
Grammatical rule used: Use “a” with
non-specific singular countable nouns.
Example: She wore a jacket because it was
a cold day.
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Information Booster:
✔ Use “the” for specific things already mentioned.
✔ Use “a/an” for non-specific or first-time references.