(3x^2y + x^2 – 8y^2 +8) + ( 2y^2 + 6x^2y^2 – 4x^2 – 2) *

a) 6x^2y^2 +3x^2y -3x^2 -6y^2 +6
b) 5x^2y^2 +7x^2y -12x^2 +6
c)9x^2y^2 -3x^2y -6y^2 +6
d) 6x^2y^2 +3x^2y +3x^2 -6y^2 +6