P(x)= ax4+x3-bx2-4x+c if P(x) increases infinitely with the increase of x, and x also decreases infinitely, then p (x)

A) infinite rise

B) infinite decline

C) approaching the x axis from greater than zero.

D) approaching the x axis from less than zero.

E) uncertainty

You should choose (a) to infer that parameter A is greater than zero. When the absolute value of x is infinite, consider the fourth power, a >；; 0, so unlimited growth.