$\text { Find the limit of } s ( n ) \text { as } n \rightarrow \infty \text {. }$

Multiple Choice

$\text { Find the limit of } s ( n ) \text { as } n \rightarrow \infty \text {. }$ $s ( n ) = \frac { 1 } { n ^ { 2 } } \left[ \frac { n ( n + 1 ) ( 5 n + 1 ) } { 10 } \right]$

A) $1 / 10$
B) 5
C) unbounded
D) $1 / 2$
E) 1