Solve: The following question in the picture

D is the answer to your question in my opinion

I think it is option A

Explanation:

XY 2 will be three molecules which is only a or b. As molecules are usually in a ddiagr like a, I would go with option a

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.