Yet another question and help needed T_T

Dear student,

The molar mass of C-12 is 12g
Therefore, the molar mass of X is 2 x 12 = 24g and that of Y is 1.5 x 12 = 18g
One molar mass contains one mole, that is Avogadro's number of particles.
Molar mass of XY2 = 24 + 2 x 18 = 24 + 36 = 60 g.
Therefore, 120g of XY2 has 120/60 = 2 moles of XY2.
One mole of XY2 has 3 moles of X and Y, then, 2 mole of XY2 has 6 moles of X and Y.
6 moles of atoms has 6 x Avogadro's number of atoms = $6\times 6.022 \times {10}^{23}=36.132\times {10}^{23} atoms$
Answer is B.

Regards