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

Options

A. 12 g of carbon combines with 32 g of oxygen to form 44 g of `CO_(2)`
B. When 12 g of carbon is heated in a vacuum there is no change in mass
C. A sample of air increases in volume when heated at constant pressure but its mass remains unaltered
D. The weight of a piece of platinum is the same before and after heating in air

Answer

A

Explanation

12 g of carbon combines with 32 g of oxygen to form 44 g of `CO_(2)`