What energy transformation occur when wood is burned

C. Chemical energy transforms into thermal energy and light energy.

The reason why this is the answer is because thermal energy and heat energy are basically the same things, so D is wrong. Another reason why is because the wood wasn't on fire to begin with so it cant be A. The final reason is that wood cannot create electricity. 

While unproven, it uses facts to support part of a conclusion. it is still factual and has predictive power, however.