Concept:A sentence must contain a verb to be grammatically complete.
Explanation:The error is in part (b) "jam common breakfast items".
Here, the verb "are" is missing between "jam" and "common".
The corrected phrase should be "jam are common breakfast items".
The subjects "Bread, butter and jam" are plural, so the plural verb "are" is required.
Without the verb, the sentence becomes a fragment, lacking a predicate.
The verb "are" connects the subjects to the description "common breakfast items".
Parts (a) and (c) are correct: "Bread, butter and" and "that are consumed by many households".
Thus, the error lies only in part (b).
Answer:Option B (b)