3g of hydrocarbon on combustion with 11.2g of oxygen produce 8.8g of $CO_2$ and 5.4g of $H_2O$.The data illustrates the law of

Question

$\begin{array}{1 1}Conservation \;of\;mass \\ Multiple\;proportions \\ Constant \;proportions \\ None\;of \;these \end{array}$