Mark places new batteries in his cd player and turns it on. identify the correct energy transformation. electrical → chemical → mechanical and sound chemical → electrical → mechanical and sound sound → chemical → mechanical and electrical mechanical → chemical → electrical and sound

Answer is:
Chemical → electrical → mechanical and sound 

Explanation:
Let's take this step by step:
1- For the batteries to work, chemical reactions must occur within the battery itself. This is considered "chemical energy"
2- For the CD player to start operating, it needs electrical energy that is supplied from the batteries
3- When the CD player gains this electrical energy, it can then function correctly and play the songs producing mechanical and sound energies.

So, basically the flow goes as follows:
Chemical reactions within the batteries lead to the formation of electrical energy which operates the CD player producing mechanical and sound energy.

Hope this helps :)