Which of the following is the best example of the law of conservation of mass? [NDA]

• 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.