The arrows represented most likely indicate is Energy released from metabolism into the environment as heat.
What is the food chain?
A food chain describes how energy and nutrients move through an ecosystem. At the basic level there are plants that produce the energy, then it moves up to higher-level organisms like herbivores. After that when carnivores eat the herbivores, energy is transferred from one to the other
Thus, option 'A' is correct.
To learn more about the food chain click here:
