Sufficient.Answer: B.Pleas use ^ for powers, and formating for formulas.answer is definitely B , as the product of 2 consecutive even numbers is divisible by 4.There is a small typo above , it should be (y-1) and (y+1) are 2 consecutive even numbers and not (y-1 ) and ( y-1) are 2 consecutive even numbers , Hope this prevents any confusion.Thank you. _________________