Final answer:
The best example of a process involving energy transfer is a plant using light energy to grow, as it converts light energy from the sun into chemical energy through photosynthesis.
Step-by-step explanation:
The student is asking about examples of processes involving energy transfer. The example that best describes this process is D) A plant using light energy to grow. This process, called photosynthesis, involves the conversion of electromagnetic radiation (light energy from the sun) into chemical energy, which is stored in the plant. This energy transfer and transformation are necessary for the plant's growth and for sustaining life on Earth, as this chemical energy in plants forms the base of the food chain.
Other options, such as turning on a lamp or light reaching Earth from the sun, involve energy transfer but do not involve the same type of transformation into chemical energy. The movement of a sand dune, while it does involve kinetic energy due to wind, does not strongly illustrate the concept of energy transformation involved in the question.