Correct option (A) Meatless days
Explanation:
"Meatless days" This is the name of a novel. Hence, no error is there.
Have been made : (Erroneous)
Because 'have' should be replaced with 'has' because 'meatless days' is a singular noun.
Into a film :
No error in this part of the sentence. No error : Incorrect option because there is an error in the sentence.
