8. For any $\triangle A B C$, let its perimeter, circumradius, and inradius be $l, R$ and $r$, respectively. Then:
(A) $l>R+r$
(B) $l \leqslant R+r$
(C) $\frac{1}{6}<R+r<6 l$
(D) None of the above relationships (A), (B), or (C) are correct
(D)
8. 【Analysis and Solution】First, draw a circle with radius $R$. For any positive integer $N$, on this circumference, we can always find three points $A, B, C$ that are sufficiently close such that $N l$ $R, B C>R$. Then, draw the side $A C$, so
$$
l=A B+B C+C A>2 R>R+r \text {. }
$$
$\therefore$ (B) is also incorrect.