Final answer:
The main advantages of a light microscope over an electron microscope are that it doesn't require electric relays and it's more portable, making 'd) A and B' the correct answer.
Step-by-step explanation:
The advantage of a light microscope over an electron microscope includes the fact that it does not require electric relays, and it is indeed easier to move from place to place. Unlike electron microscopes, light microscopy can also be used to observe living cells as the process does not kill the specimen. This contrasts with the electron microscope, which offers a higher magnification and resolving power, but requires samples to be placed in a vacuum and therefore cannot be used to view living cells. Moreover, electron microscopes are also more expensive and less portable due to their size and the need for a vacuum environment.
The correct answer to the student's question would therefore be 'd) A and B' - light microscopes do not require electric relays and are easier to move from place to place.