Correct option is A
Option (a) contains an error.
Explanation: The correct structure should be: “had been busy
committing rhymes to memory.”
· “Busy” should be followed by a gerund (verb + ing), not the past participle “committed”.
Corrected Sentence: For a fortnight, toddlers at St Andrew’s had been busy
committing rhymes to memory in preparation for their big performance.
Grammatical Rule Used: When “busy” is followed by a verb, that verb should be in the “-ing” form (gerund).
Example: She was busy cooking dinner when I arrived.
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Information Booster: “Busy + verb-ing” is a fixed grammatical construction in English to indicate continuous or recent engagement in an activity.