The density of a liquid is $1.2 \mathrm{~g} / \mathrm{mL}$. There are 35 drops in $2 \mathrm{~mL}$. The number of molecules in one drop (molar mass of liquid $=70 \mathrm{~g} / \mathrm{mol}$ ) is :

(A) $\left(\frac{1.2}{35}\right) \mathrm{N}_{\mathrm{A}}$

(B) $\frac{1}{12}\left(\frac{1}{35}\right)^{2} \mathrm{~N}_{\mathrm{A}}$

(C) $\frac{1.2}{(35)^{2}} \mathrm{~N}_{\mathrm{A}}$

(D) $1.2 \mathrm{~N}_{\mathrm{A}}$