Question

The products in a decomposition reaction ___.
A. Include an element and a compound.
B. Are elements.
C. Are compounds
D. Can be elements or compounds

Answer 1

Decomposition reactions are the opposite of synthesis reactions.
AB-->A+B
The process produces elements or simpler compounds, so I would say D

Reference this, its pretty good

http://www.chemteam.info/Equations/Decomposition.html