Final answer:
The most relevant energy transformation in the process of sending burgers through a grilling machine on a conveyor belt is mechanical to thermal energy transformation (C).
Step-by-step explanation:
The most relevant energy transformation in the process of sending burgers through a grilling machine on a conveyor belt is mechanical to thermal energy transformation (C).
The burgers are initially pushed by the mechanical energy of the conveyor belt. As they pass through the grilling machine, the thermal energy from the heating elements is transferred to the burgers and cooks them.
Therefore, in this process, mechanical energy is transformed into thermal energy.