$(4x^3y+4x^2z-3x^2)+(x^3y-2x^2-5x^2z)$ <br>is equivalent to :

Question

$\begin{array}{1 1} (a)\;3x^3y-x^2z-5x^2 \\ (b)\;3x^3y-x^2z+5x^2 \\(c)\;5x^3y-x^2z-5x^2 \\(d)\;3x^3y+x^2z-5x^2 \end{array} $