Which of the following is the best example of law of conservation of mass

Options

A. When 12 gm of carbon is heated in vacuum, there is no change in mass
B. Weight of platinum wire is the same before and after heating
C. A sample of air increases in volume when heated at constant pressure but mass remains unchanged
D. 12 gm of carbon combines with 32 gm of oxygen to give 44 gm of carbondioxide.

Answer

A

Explanation

According to the law of conservation of mass " In any chemical reaction mass reactants remains always equal to the mass of product". i.e. O, mass remain conserve.