Determine What Statement Is True $\frac { n ( n + 1 ) } { 2 }$

Multiple Choice

Determine what statement is true.
The sum of the first n positive integers is

A) $\frac { n ( n + 1 ) } { 2 }$
B) $\frac { n ^ { 2 } ( n + 1 ) ^ { 2 } } { 4 }$