Identify Which of the Twelve Basic Functions Listed Below Fit $\lim _ { x \rightarrow \infty } f ( x ) = - \infty$

Multiple Choice

Identify which of the twelve basic functions listed below fit the description given.
-The three functions with end behavior $\lim _ { x \rightarrow \infty } f ( x ) = - \infty$

A) $y = x , y = \frac { 1 } { 1 + e ^ { - x } } , y = \operatorname { int } ( x )$
B) $y = x , y = x ^ { 3 } , y = \frac { 1 } { 1 + e ^ { - x } }$
C) $y = x , y = x ^ { 3 } , y = \operatorname { int } ( x )$
D) $y = x ^ { 2 } , y = x ^ { 3 } , y = \operatorname { int } ( x )$