Which example illustrates the associative property of addition for polynomials?
A$\begin{array}{l} {\left[\left(2 x^2+5 x\right)+\left(4 x^2-4 x\right)\right]+5 x^3} \\ ={\left[\left(5 x+2 x^2\right)+\left(-4 x+4 x^2\right)\right]+5 x^3} \end{array}$
B$\begin{array}{l} {\left[\left(2 x^2+5 x\right)+\left(4 x^2-4 x\right)\right]+5 x^3} \\ ={\left[\left(4 x^2-4 x\right)+\left(2 x^2+5 x\right)\right]+5 x^3} \end{array}$
C$\begin{array}{l} \left(2 x^2+5 x\right)+\left[\left(4 x^2-4 x\right)+5 x^3\right] \\ =\left(2 x^2+5 x\right)+\left[5 x^3+\left(4 x^2-4 x\right)\right] \end{array}$
D$\left[\left(2 x^2+5 x\right)+\left(4 x^2-4 x\right)\right]+5 x^3 = \left(2 x^2+5 x\right)+\left[\left(4 x^2-4 x\right)+5 x^3\right]$
A$\begin{array}{l} {\left[\left(2 x^2+5 x\right)+\left(4 x^2-4 x\right)\right]+5 x^3} \\ ={\left[\left(5 x+2 x^2\right)+\left(-4 x+4 x^2\right)\right]+5 x^3} \end{array}$
B$\begin{array}{l} {\left[\left(2 x^2+5 x\right)+\left(4 x^2-4 x\right)\right]+5 x^3} \\ ={\left[\left(4 x^2-4 x\right)+\left(2 x^2+5 x\right)\right]+5 x^3} \end{array}$
C$\begin{array}{l} \left(2 x^2+5 x\right)+\left[\left(4 x^2-4 x\right)+5 x^3\right] \\ =\left(2 x^2+5 x\right)+\left[5 x^3+\left(4 x^2-4 x\right)\right] \end{array}$
D$\left[\left(2 x^2+5 x\right)+\left(4 x^2-4 x\right)\right]+5 x^3 = \left(2 x^2+5 x\right)+\left[\left(4 x^2-4 x\right)+5 x^3\right]$