3. When $n$ takes all natural numbers greater than 1, among the following four expressions, the one that never takes a perfect square value is ( ).
(A) $5 n^{2}-5 n-5$
(B) $3 n^{2}-3 n+3$
(C) $9 n^{2}-9 n+9$
(D) $11 n^{2}-11 n-11$