$[(7 x+3)+2 y]^{2}$ A) $49 x^{2}+28 x y+4 y^{2}$ B) $49 x^{2}+42 x+28 x y+12 y+4 y^{2}$

Multiple Choice

$[(7 x+3) +2 y]^{2}$

A) $49 x^{2}+28 x y+4 y^{2}$
B) $49 x^{2}+42 x+28 x y+12 y+4 y^{2}$
C) $49 x^{2}+42 x+9+28 x y+12 y+4 y^{2}$
D) $49 x^{2}+21 x+9+14 x y+6 y+4 y^{2}$