The correct option is C AB→A+B
In a decomposition reaction, a single compound splits into two or more simple substances. For example, silver chloride decomposes into silver and chlorine on heating. The reaction for the same is given below:
2AgCl(s) Sunlight−−−−−−→ 2Ag(s)+Cl2(g)
So, the general representation of a decomposition reaction is AB→A + B