The answer is d because compounds are considered as molecules.
molecules are made up of two or more atoms and compounds have at least 2 atoms
A. decompisition
B. double replacement
C. combustion ( i think)
D. this one is also another form of decomposition, I think.
E. Once again, another form of double replacement.
I hope these helped, and, if so, please mark as brainliest :P
Good luck!