Correct option is B
Option (b) contains an error. The error lies in the subject-verb agreement. The subject "The box" is singular, but the verb "were" used in the segment is plural. The correct verb should be "was" to match the singular subject. Thus, the corrected segment should read "The box containing the apples from the valleys of Kashmir was thrown away by Gautam."
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Grammatical rule used: Subject-verb agreement requires that the verb must agree in number with its subject. Singular subjects take singular verbs, and plural subjects take plural verbs.
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Example: The basket full of fruits is on the table (not "are on the table").