How can the law of conservation of mass apply to a burning log, if all that remains of it is ash?

A. The law of conservation of mass applies to substitution and displacement reactions only
B. The mass of the gases and water vapor released plus the ash, equal the mass before burning
C. The law of conservation applies to changes of state, not to chemical reactions
D. The ash has the same mass as the log, although a large percentage of it blows away

Right/first answer gets brainliest <3