Select the correct collective noun to make the sentence grammatically correct. I saw a ______ of crows sitting on the roof last evening.
Which of the phrases given below the sentence should replace the word/phrase given in underline in the sentence to make it grammatically correct? If the sentence is correct as it is given and no correction is required, select 'No correction required' as the answer. Reaching collective decisions based on individual preferences is an imperfect science.