Here's a problem to solve: An engineering class has been instructed to develop a robot. The robot must be designed using electromagnetic energy as its only source of power. What topic is the engineering class most likely studying?

Among the 4 following options, which is the correct answer?

- A: the use of batteries and chemical energy
 
- B: how radiant energy and solar collectors can be used
 
- C: the conversion of kinetic energy to potential energy
 
- D: how thermal energy can be converted into electrical energy
 