Question: Which of the following is the best example of the 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 carbon dioxide.