Answer: C, matter is changed into various forms but the total quantity remains unchanged.
Step-by-step explanation: The Law of Conservation of Matter directly states that in any food chain, matter is not lost, but conserved.. (hence the name). Thus, matter may decompose, or be digested, but it is never completely destroyed.
For example: When you burn a log, the log still turns into ash.
Hope this helps,
LaciaMelodii :)