A stack of newspapers is burned completely to ash in a laboratory. How does the resulting mass relate to the initial mass of the stack of newspapers?

a
The mass of the gases and the ash should equal the mass of the initial stack of newspapers.
b
The mass of the gases and the ash should be double the mass of the initial stack of newspapers.
c
The mass of the gases and the ash should be one-fourth the mass of the initial stack of newspapers.
d
The mass of the gases and the ash should be one-half the mass of the initial stack of newspapers.

d. The mass of the gases and the ash should be one-half the mass of the initial stack of newspapers.

Is it me or this ai always picking D.